io3fix/src/aframe/component/architecture-toolkit/wall.js

toolkit for interior apps

'use strict';

// dependencies

import getSchema from './common/get-schema.js'
import getMaterial from './common/get-material.js'
import updateSchema from './common/update-schema.js'
import generateNormals from '../../../utils/data3d/buffer/get-normals'
import generateUvs from '../../../utils/data3d/buffer/get-uvs'
import cloneDeep from 'lodash/cloneDeep'
import sortBy from 'lodash/sortBy'

export default {

  schema: getSchema('wall'),

  init: function () {
    var this_ = this
    // avoid simultanous update calls
    this.throttledUpdate = AFRAME.utils.throttle(this.update, 10, this);
    // bind event listeners for child elements
    this.updateChildren()
    // listen for added or removed children
    this.el.addEventListener('child-attached', function(evt) {
      // wait for a bit to make sure the child component is set up
      setTimeout(function() {
        this_.throttledUpdate()
        this_.updateChildren()
      }, 10)
    })
    this.el.addEventListener('child-detached', function(evt) {
      setTimeout(function() {
        this_.throttledUpdate()
      }, 10)
    })
  },

  updateChildren: function() {
    var this_ = this
    var children = this.el.children
    // listen to children, for updated positions
    if (children && children.length) {
      for (var i = 0; i < children.length; i++) {
        children[i].addEventListener('componentchanged', function() {
          setTimeout(function() {
            // FIXME: we need to wait till the new data is actually available
            this_.throttledUpdate()
          }, 20)
        })
      }
    }
  },

  updateSchema: updateSchema,

  update: function (oldData) {
    var this_ = this
    var data = this_.data

    if (!oldData || this.data.w !== oldData.w || this.data.controlLine !== oldData.controlLine ) {
      this.el.emit('wall-changed', {w: this.data.w, controlLine: this.data.controlLine})
    }

    // remove old mesh
    this.remove()

    // get defaults and
    this.attributes = cloneDeep(data)

    // get children for walls
    var children = this_.el.children
    this.attributes.children = []
    for (var i = 0; i < children.length; i++) {
      var c = children[i].getAttribute('io3d-window') || children[i].getAttribute('io3d-door')
      if (c) {
        if (children[i].getAttribute('io3d-window')) c.type = 'window'
        else if (children[i].getAttribute('io3d-door')) c.type = 'door'
        var pos = children[i].getAttribute('position')
        Object.keys(pos).forEach(p => {
          c[p] = pos[p]
        })
        this.attributes.children.push(c)
      } else console.log('invalid child')
    }
    // this.attributes.children = this.attributes.children.map(c => mapAttributes(cloneDeep(getType.get(c.type).params), c))

    // get meshes and materials from el3d modules
    var meshes = this.generateMeshes3d()

    // clean up empty meshes to prevent errors
    var meshKeys = Object.keys(meshes)
    meshKeys.forEach(key => {
      if (!meshes[key].positions || !meshes[key].positions.length) {
        // console.warn('no vertices for mesh', key)
        delete meshes[key]
      }
    })

    // setup materials
    // defaults
    var materials = {
      front: 'default_plaster_001', //'basic-wall',
      back: 'default_plaster_001', //'basic-wall',
      base: {
        colorDiffuse: [ 0.95, 0.95, 0.95 ]
      },
      top: 'wall_top'
    }

    // check for adapted materials
    var materialKeys = Object.keys(data).filter(function(key) {
      return key.indexOf('material_') > -1
    })
    // add materials to instance
    materialKeys.forEach(function(key) {
      var mesh = key.replace('material_', '')
      materials[mesh] = data[key]
    })

    // fetch materials from mat library
    Object.keys(materials).forEach(mat => {
      materials[mat] = getMaterial(materials[mat])
    })

    // construct data3d object
    var data3d = {
      meshes: meshes,
      materials: materials
    }

    // create new one
    this_.mesh = new THREE.Object3D()
    this_.data3dView = new io3d.aFrame.three.Data3dView({parent: this_.mesh})

    // update view
    this_.data3dView.set(data3d)
    this_.el.setObject3D('mesh', this_.mesh)
    // emit event
    this_.el.emit('mesh-updated');
  },

  remove: function () {
    if (this.data3dView) {
      this.data3dView.destroy()
      this.data3dView = null
    }
    if (this.mesh) {
      this.el.removeObject3D('mesh')
      this.mesh = null
    }
  },

  generateMeshes3d: function () {
    var a = this.attributes

    // get children
    var children = a.children
    children = sortBy(children, function (model) {
      if (model.a !== undefined) {
        return model.a.x
      } else {
        return model.x
      }
    })

    // geometry
    var baseHeightFront = a.frontHasBase ? a.baseHeight : 0,
      baseHeightBack = a.backHasBase ? a.baseHeight : 0,
      // walls are drawn along their controlLine
      controlLine = a.controlLine ? a.controlLine : 'back',

      baseVertices = [],
      baseVerticesPointer = 0,
      frontVertices = [],
      frontVerticesPointer = 0,
      frontUvs = [],
      frontUvsPointer = 0,
      backVertices = [],
      backVerticesPointer = 0,
      backUvs = [],
      backUvsPointer = 0,
      topVertices = [],
      topVerticesPointer = 0,

      pointer = 0,

      al = a.l,
      // wall width
      aw = a.w,
      // back position
      azb = controlLine === 'front' ? -aw : controlLine === 'center' ? -aw / 2 : 0,
      // front position
      azf = azb + aw,
      ah = a.h,

      c, cPrev, cNext, cx, cy, cz, cl, cw, ch, _y1, _y2, _yf, _yb

    for (var i = 0, l = children.length; i < l; i++) {

      c = (children[ i ].a) ? children[ i ].a : children[ i ] // children attributes
      cPrev = children[ i - 1 ] ? children[ i - 1 ].a : null // previous children attributes
      cNext = children[ i + 1 ] ? children[ i + 1 ].a : null // next children attributes

      cx = c.x
      cy = c.y
      cl = c.l
      cw = c.w
      ch = c.h
      cz = c.side === 'front' ? azf : c.side === 'center' ? azb + aw / 2 : azb

      // wall before children

      if (pointer < cx) {

        // front quad vertices
        frontVertices[ frontVerticesPointer ] = frontVertices[ frontVerticesPointer + 9 ] = pointer
        frontVertices[ frontVerticesPointer + 1 ] = frontVertices[ frontVerticesPointer + 10 ] = baseHeightFront
        frontVertices[ frontVerticesPointer + 2 ] = frontVertices[ frontVerticesPointer + 11 ] = azf
        frontVertices[ frontVerticesPointer + 3 ] = cx
        frontVertices[ frontVerticesPointer + 4 ] = baseHeightFront
        frontVertices[ frontVerticesPointer + 5 ] = azf
        frontVertices[ frontVerticesPointer + 6 ] = frontVertices[ frontVerticesPointer + 12 ] = cx
        frontVertices[ frontVerticesPointer + 7 ] = frontVertices[ frontVerticesPointer + 13 ] = ah
        frontVertices[ frontVerticesPointer + 8 ] = frontVertices[ frontVerticesPointer + 14 ] = azf
        frontVertices[ frontVerticesPointer + 15 ] = pointer
        frontVertices[ frontVerticesPointer + 16 ] = ah
        frontVertices[ frontVerticesPointer + 17 ] = azf
        frontVerticesPointer += 18
        // front quad uvs
        frontUvs[ frontUvsPointer ] = frontUvs[ frontUvsPointer + 6 ] = pointer
        frontUvs[ frontUvsPointer + 1 ] = frontUvs[ frontUvsPointer + 7 ] = baseHeightFront
        frontUvs[ frontUvsPointer + 2 ] = cx
        frontUvs[ frontUvsPointer + 3 ] = baseHeightFront
        frontUvs[ frontUvsPointer + 4 ] = frontUvs[ frontUvsPointer + 8 ] = cx
        frontUvs[ frontUvsPointer + 5 ] = frontUvs[ frontUvsPointer + 9 ] = ah
        frontUvs[ frontUvsPointer + 10 ] = pointer
        frontUvs[ frontUvsPointer + 11 ] = ah
        frontUvsPointer += 12

        // front baseboard quad vertices
        if (baseHeightFront) {
          baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
          baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = 0
          baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = azf
          baseVertices[ baseVerticesPointer + 3 ] = cx
          baseVertices[ baseVerticesPointer + 4 ] = 0
          baseVertices[ baseVerticesPointer + 5 ] = azf
          baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = cx
          baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = baseHeightFront
          baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = azf
          baseVertices[ baseVerticesPointer + 15 ] = pointer
          baseVertices[ baseVerticesPointer + 16 ] = baseHeightFront
          baseVertices[ baseVerticesPointer + 17 ] = azf
          baseVerticesPointer += 18
        }

        // back quad vertices
        backVertices[ backVerticesPointer ] = backVertices[ backVerticesPointer + 9 ] = pointer
        backVertices[ backVerticesPointer + 1 ] = backVertices[ backVerticesPointer + 10 ] = ah
        backVertices[ backVerticesPointer + 2 ] = backVertices[ backVerticesPointer + 11 ] = azb
        backVertices[ backVerticesPointer + 3 ] = cx
        backVertices[ backVerticesPointer + 4 ] = ah
        backVertices[ backVerticesPointer + 5 ] = azb
        backVertices[ backVerticesPointer + 6 ] = backVertices[ backVerticesPointer + 12 ] = cx
        backVertices[ backVerticesPointer + 7 ] = backVertices[ backVerticesPointer + 13 ] = baseHeightBack
        backVertices[ backVerticesPointer + 8 ] = backVertices[ backVerticesPointer + 14 ] = azb
        backVertices[ backVerticesPointer + 15 ] = pointer
        backVertices[ backVerticesPointer + 16 ] = baseHeightBack
        backVertices[ backVerticesPointer + 17 ] = azb
        backVerticesPointer += 18
        // back quad uvs
        backUvs[ backUvsPointer ] = backUvs[ backUvsPointer + 6 ] = pointer
        backUvs[ backUvsPointer + 1 ] = backUvs[ backUvsPointer + 7 ] = ah
        backUvs[ backUvsPointer + 2 ] = cx
        backUvs[ backUvsPointer + 3 ] = ah
        backUvs[ backUvsPointer + 4 ] = backUvs[ backUvsPointer + 8 ] = cx
        backUvs[ backUvsPointer + 5 ] = backUvs[ backUvsPointer + 9 ] = baseHeightBack
        backUvs[ backUvsPointer + 10 ] = pointer
        backUvs[ backUvsPointer + 11 ] = baseHeightBack
        backUvsPointer += 12

        // back baseboard quad vertices
        if (baseHeightBack) {
          baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
          baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = baseHeightBack
          baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = azb
          baseVertices[ baseVerticesPointer + 3 ] = cx
          baseVertices[ baseVerticesPointer + 4 ] = baseHeightBack
          baseVertices[ baseVerticesPointer + 5 ] = azb
          baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = cx
          baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = 0
          baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = azb
          baseVertices[ baseVerticesPointer + 15 ] = pointer
          baseVertices[ baseVerticesPointer + 16 ] = 0
          baseVertices[ baseVerticesPointer + 17 ] = azb
          baseVerticesPointer += 18
        }

        // top quad vertices
        topVertices[ topVerticesPointer ] = topVertices[ topVerticesPointer + 9 ] = pointer
        topVertices[ topVerticesPointer + 1 ] = topVertices[ topVerticesPointer + 10 ] = ah
        topVertices[ topVerticesPointer + 2 ] = topVertices[ topVerticesPointer + 11 ] = azf
        topVertices[ topVerticesPointer + 3 ] = cx
        topVertices[ topVerticesPointer + 4 ] = ah
        topVertices[ topVerticesPointer + 5 ] = azf
        topVertices[ topVerticesPointer + 6 ] = topVertices[ topVerticesPointer + 12 ] = cx
        topVertices[ topVerticesPointer + 7 ] = topVertices[ topVerticesPointer + 13 ] = ah
        topVertices[ topVerticesPointer + 8 ] = topVertices[ topVerticesPointer + 14 ] = azb
        topVertices[ topVerticesPointer + 15 ] = pointer
        topVertices[ topVerticesPointer + 16 ] = ah
        topVertices[ topVerticesPointer + 17 ] = azb
        topVerticesPointer += 18

        if (pointer === 0) {
          // start face of the wall if there are openings in the wall
          // react to wall controlLine position
          if (azf > 0) {
            // left side quad vertices
            frontVertices[ frontVerticesPointer ] = frontVertices[ frontVerticesPointer + 9 ] = pointer
            frontVertices[ frontVerticesPointer + 1 ] = frontVertices[ frontVerticesPointer + 10 ] = baseHeightFront
            frontVertices[ frontVerticesPointer + 2 ] = frontVertices[ frontVerticesPointer + 11 ] = 0
            frontVertices[ frontVerticesPointer + 3 ] = pointer
            frontVertices[ frontVerticesPointer + 4 ] = baseHeightFront
            frontVertices[ frontVerticesPointer + 5 ] = azf
            frontVertices[ frontVerticesPointer + 6 ] = frontVertices[ frontVerticesPointer + 12 ] = pointer
            frontVertices[ frontVerticesPointer + 7 ] = frontVertices[ frontVerticesPointer + 13 ] = ah
            frontVertices[ frontVerticesPointer + 8 ] = frontVertices[ frontVerticesPointer + 14 ] = azf
            frontVertices[ frontVerticesPointer + 15 ] = pointer
            frontVertices[ frontVerticesPointer + 16 ] = ah
            frontVertices[ frontVerticesPointer + 17 ] = 0
            frontVerticesPointer += 18
            // left side quad uvs
            frontUvs[ frontUvsPointer ] = frontUvs[ frontUvsPointer + 6 ] = 0
            frontUvs[ frontUvsPointer + 1 ] = frontUvs[ frontUvsPointer + 7 ] = baseHeightFront
            frontUvs[ frontUvsPointer + 2 ] = azf
            frontUvs[ frontUvsPointer + 3 ] = baseHeightFront
            frontUvs[ frontUvsPointer + 4 ] = frontUvs[ frontUvsPointer + 8 ] = azf
            frontUvs[ frontUvsPointer + 5 ] = frontUvs[ frontUvsPointer + 9 ] = ah
            frontUvs[ frontUvsPointer + 10 ] = 0
            frontUvs[ frontUvsPointer + 11 ] = ah
            frontUvsPointer += 12

            // left side baseboard quad vertrices
            if (baseHeightFront) {
              baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
              baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = 0
              baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = 0
              baseVertices[ baseVerticesPointer + 3 ] = pointer
              baseVertices[ baseVerticesPointer + 4 ] = 0
              baseVertices[ baseVerticesPointer + 5 ] = azf
              baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer
              baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = baseHeightFront
              baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = azf
              baseVertices[ baseVerticesPointer + 15 ] = pointer
              baseVertices[ baseVerticesPointer + 16 ] = baseHeightFront
              baseVertices[ baseVerticesPointer + 17 ] = 0
              baseVerticesPointer += 18
            }
          }
          if (azb < 0) {
            // left side quad vertices
            backVertices[ backVerticesPointer ] = backVertices[ backVerticesPointer + 9 ] = pointer
            backVertices[ backVerticesPointer + 1 ] = backVertices[ backVerticesPointer + 10 ] = baseHeightBack
            backVertices[ backVerticesPointer + 2 ] = backVertices[ backVerticesPointer + 11 ] = azb
            backVertices[ backVerticesPointer + 3 ] = pointer
            backVertices[ backVerticesPointer + 4 ] = baseHeightBack
            backVertices[ backVerticesPointer + 5 ] = 0
            backVertices[ backVerticesPointer + 6 ] = backVertices[ backVerticesPointer + 12 ] = pointer
            backVertices[ backVerticesPointer + 7 ] = backVertices[ backVerticesPointer + 13 ] = ah
            backVertices[ backVerticesPointer + 8 ] = backVertices[ backVerticesPointer + 14 ] = 0
            backVertices[ backVerticesPointer + 15 ] = pointer
            backVertices[ backVerticesPointer + 16 ] = ah
            backVertices[ backVerticesPointer + 17 ] = azb
            backVerticesPointer += 18
            // left side quad uvs
            backUvs[ backUvsPointer ] = backUvs[ backUvsPointer + 6 ] = 0
            backUvs[ backUvsPointer + 1 ] = backUvs[ backUvsPointer + 7 ] = baseHeightBack
            backUvs[ backUvsPointer + 2 ] = azb
            backUvs[ backUvsPointer + 3 ] = baseHeightBack
            backUvs[ backUvsPointer + 4 ] = backUvs[ backUvsPointer + 8 ] = azb
            backUvs[ backUvsPointer + 5 ] = backUvs[ backUvsPointer + 9 ] = ah
            backUvs[ backUvsPointer + 10 ] = 0
            backUvs[ backUvsPointer + 11 ] = ah
            backUvsPointer += 12

            // left side baseboard quad vertrices
            if (baseHeightBack) {
              baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
              baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = 0
              baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = azb
              baseVertices[ baseVerticesPointer + 3 ] = pointer
              baseVertices[ baseVerticesPointer + 4 ] = 0
              baseVertices[ baseVerticesPointer + 5 ] = 0
              baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer
              baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = baseHeightBack
              baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = 0
              baseVertices[ baseVerticesPointer + 15 ] = pointer
              baseVertices[ baseVerticesPointer + 16 ] = baseHeightBack
              baseVertices[ baseVerticesPointer + 17 ] = azb
              baseVerticesPointer += 18
            }
          }
        }
      }

      // move pointer position
      pointer = cx

      // wall below children
      if (cy > 0) {
        var baseHeightBackBelow = baseHeightBack > c.y ? c.y : baseHeightBack
        var baseHeightFrontBelow = baseHeightFront > c.y ? c.y : baseHeightFront

        if (c.y > baseHeightFront){
          // front quad vertices
          frontVertices[ frontVerticesPointer ] = frontVertices[ frontVerticesPointer + 9 ] = pointer
          frontVertices[ frontVerticesPointer + 1 ] = frontVertices[ frontVerticesPointer + 10 ] = baseHeightFront
          frontVertices[ frontVerticesPointer + 2 ] = frontVertices[ frontVerticesPointer + 11 ] = azf
          frontVertices[ frontVerticesPointer + 3 ] = pointer + cl
          frontVertices[ frontVerticesPointer + 4 ] = baseHeightFront
          frontVertices[ frontVerticesPointer + 5 ] = azf
          frontVertices[ frontVerticesPointer + 6 ] = frontVertices[ frontVerticesPointer + 12 ] = pointer + cl
          frontVertices[ frontVerticesPointer + 7 ] = frontVertices[ frontVerticesPointer + 13 ] = cy
          frontVertices[ frontVerticesPointer + 8 ] = frontVertices[ frontVerticesPointer + 14 ] = azf
          frontVertices[ frontVerticesPointer + 15 ] = pointer
          frontVertices[ frontVerticesPointer + 16 ] = cy
          frontVertices[ frontVerticesPointer + 17 ] = azf
          frontVerticesPointer += 18
          // front quad uvs
          frontUvs[ frontUvsPointer ] = frontUvs[ frontUvsPointer + 6 ] = pointer
          frontUvs[ frontUvsPointer + 1 ] = frontUvs[ frontUvsPointer + 7 ] = baseHeightFront
          frontUvs[ frontUvsPointer + 2 ] = pointer + cl
          frontUvs[ frontUvsPointer + 3 ] = baseHeightFront
          frontUvs[ frontUvsPointer + 4 ] = frontUvs[ frontUvsPointer + 8 ] = pointer + cl
          frontUvs[ frontUvsPointer + 5 ] = frontUvs[ frontUvsPointer + 9 ] = cy
          frontUvs[ frontUvsPointer + 10 ] = pointer
          frontUvs[ frontUvsPointer + 11 ] = cy
          frontUvsPointer += 12
        }

        if (baseHeightFront) {
          // front baseboard quad vertices
          baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
          baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = 0
          baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = azf
          baseVertices[ baseVerticesPointer + 3 ] = pointer + cl
          baseVertices[ baseVerticesPointer + 4 ] = 0
          baseVertices[ baseVerticesPointer + 5 ] = azf
          baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer + cl
          baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = baseHeightFrontBelow
          baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = azf
          baseVertices[ baseVerticesPointer + 15 ] = pointer
          baseVertices[ baseVerticesPointer + 16 ] = baseHeightFrontBelow
          baseVertices[ baseVerticesPointer + 17 ] = azf
          baseVerticesPointer += 18
        }

        if (c.y>baseHeightBack){
          // back quad vertices
          backVertices[ backVerticesPointer ] = backVertices[ backVerticesPointer + 9 ] = pointer
          backVertices[ backVerticesPointer + 1 ] = backVertices[ backVerticesPointer + 10 ] = cy
          backVertices[ backVerticesPointer + 2 ] = backVertices[ backVerticesPointer + 11 ] = azb
          backVertices[ backVerticesPointer + 3 ] = pointer + cl
          backVertices[ backVerticesPointer + 4 ] = cy
          backVertices[ backVerticesPointer + 5 ] = azb
          backVertices[ backVerticesPointer + 6 ] = backVertices[ backVerticesPointer + 12 ] = pointer + cl
          backVertices[ backVerticesPointer + 7 ] = backVertices[ backVerticesPointer + 13 ] = baseHeightBack
          backVertices[ backVerticesPointer + 8 ] = backVertices[ backVerticesPointer + 14 ] = azb
          backVertices[ backVerticesPointer + 15 ] = pointer
          backVertices[ backVerticesPointer + 16 ] = baseHeightBack
          backVertices[ backVerticesPointer + 17 ] = azb
          backVerticesPointer += 18
          // back quad uvs
          backUvs[ backUvsPointer ] = backUvs[ backUvsPointer + 6 ] = pointer
          backUvs[ backUvsPointer + 1 ] = backUvs[ backUvsPointer + 7 ] = cy
          backUvs[ backUvsPointer + 2 ] = pointer + cl
          backUvs[ backUvsPointer + 3 ] = cy
          backUvs[ backUvsPointer + 4 ] = backUvs[ backUvsPointer + 8 ] = pointer + cl
          backUvs[ backUvsPointer + 5 ] = backUvs[ backUvsPointer + 9 ] = baseHeightBack
          backUvs[ backUvsPointer + 10 ] = pointer
          backUvs[ backUvsPointer + 11 ] = baseHeightBack
          backUvsPointer += 12
        }

        if (baseHeightBack) {
          // back base quad vertices
          baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
          baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = baseHeightBackBelow
          baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = azb
          baseVertices[ baseVerticesPointer + 3 ] = pointer + cl
          baseVertices[ baseVerticesPointer + 4 ] = baseHeightBackBelow
          baseVertices[ baseVerticesPointer + 5 ] = azb
          baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer + cl
          baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = 0
          baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = azb
          baseVertices[ baseVerticesPointer + 15 ] = pointer
          baseVertices[ baseVerticesPointer + 16 ] = 0
          baseVertices[ baseVerticesPointer + 17 ] = azb
          baseVerticesPointer += 18
        }

        // top quad vertices below opening
        // react to opening z-position
        if (azf > cz) {
          if (c.y > baseHeightFront) {
            // baseboard lower than opening
            frontVertices[ frontVerticesPointer ] = frontVertices[ frontVerticesPointer + 9 ] = pointer
            frontVertices[ frontVerticesPointer + 1 ] = frontVertices[ frontVerticesPointer + 10 ] = cy
            frontVertices[ frontVerticesPointer + 2 ] = frontVertices[ frontVerticesPointer + 11 ] = azf
            frontVertices[ frontVerticesPointer + 3 ] = pointer + cl
            frontVertices[ frontVerticesPointer + 4 ] = cy
            frontVertices[ frontVerticesPointer + 5 ] = azf
            frontVertices[ frontVerticesPointer + 6 ] = frontVertices[ frontVerticesPointer + 12 ] = pointer + cl
            frontVertices[ frontVerticesPointer + 7 ] = frontVertices[ frontVerticesPointer + 13 ] = cy
            frontVertices[ frontVerticesPointer + 8 ] = frontVertices[ frontVerticesPointer + 14 ] = cz
            frontVertices[ frontVerticesPointer + 15 ] = pointer
            frontVertices[ frontVerticesPointer + 16 ] = cy
            frontVertices[ frontVerticesPointer + 17 ] = cz
            frontVerticesPointer += 18
            // top quad uvs
            frontUvs[ frontUvsPointer ] = frontUvs[ frontUvsPointer + 6 ] = pointer
            frontUvs[ frontUvsPointer + 1 ] = frontUvs[ frontUvsPointer + 7 ] = aw
            frontUvs[ frontUvsPointer + 2 ] = pointer + cl
            frontUvs[ frontUvsPointer + 3 ] = aw
            frontUvs[ frontUvsPointer + 4 ] = frontUvs[ frontUvsPointer + 8 ] = pointer + cl
            frontUvs[ frontUvsPointer + 5 ] = frontUvs[ frontUvsPointer + 9 ] = 0
            frontUvs[ frontUvsPointer + 10 ] = pointer
            frontUvs[ frontUvsPointer + 11 ] = 0
            frontUvsPointer += 12
          } else {
            // draw baseboard
            baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
            baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = cy
            baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = azf
            baseVertices[ baseVerticesPointer + 3 ] = pointer + cl
            baseVertices[ baseVerticesPointer + 4 ] = cy
            baseVertices[ baseVerticesPointer + 5 ] = azf
            baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer + cl
            baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = cy
            baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = cz
            baseVertices[ baseVerticesPointer + 15 ] = pointer
            baseVertices[ baseVerticesPointer + 16 ] = cy
            baseVertices[ baseVerticesPointer + 17 ] = cz
            baseVerticesPointer += 18
          }

        }
        if (cz > azb) {
          if (c.y > baseHeightBack) {
            // baseboard lower than opening
            // top quad vertices
            backVertices[ backVerticesPointer ] = backVertices[ backVerticesPointer + 9 ] = pointer
            backVertices[ backVerticesPointer + 1 ] = backVertices[ backVerticesPointer + 10 ] = cy
            backVertices[ backVerticesPointer + 2 ] = backVertices[ backVerticesPointer + 11 ] = cz
            backVertices[ backVerticesPointer + 3 ] = pointer + cl
            backVertices[ backVerticesPointer + 4 ] = cy
            backVertices[ backVerticesPointer + 5 ] = cz
            backVertices[ backVerticesPointer + 6 ] = backVertices[ backVerticesPointer + 12 ] = pointer + cl
            backVertices[ backVerticesPointer + 7 ] = backVertices[ backVerticesPointer + 13 ] = cy
            backVertices[ backVerticesPointer + 8 ] = backVertices[ backVerticesPointer + 14 ] = azb
            backVertices[ backVerticesPointer + 15 ] = pointer
            backVertices[ backVerticesPointer + 16 ] = cy
            backVertices[ backVerticesPointer + 17 ] = azb
            backVerticesPointer += 18
            // top quad uvs
            backUvs[ backUvsPointer ] = backUvs[ backUvsPointer + 6 ] = pointer
            backUvs[ backUvsPointer + 1 ] = backUvs[ backUvsPointer + 7 ] = aw
            backUvs[ backUvsPointer + 2 ] = pointer + cl
            backUvs[ backUvsPointer + 3 ] = aw
            backUvs[ backUvsPointer + 4 ] = backUvs[ backUvsPointer + 8 ] = pointer + cl
            backUvs[ backUvsPointer + 5 ] = backUvs[ backUvsPointer + 9 ] = 0
            backUvs[ backUvsPointer + 10 ] = pointer
            backUvs[ backUvsPointer + 11 ] = 0
            backUvsPointer += 12
          } else {
            // draw baseboard
            baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
            baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = cy
            baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = cz
            baseVertices[ baseVerticesPointer + 3 ] = pointer + cl
            baseVertices[ baseVerticesPointer + 4 ] = cy
            baseVertices[ baseVerticesPointer + 5 ] = cz
            baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer + cl
            baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = cy
            baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = azb
            baseVertices[ baseVerticesPointer + 15 ] = pointer
            baseVertices[ baseVerticesPointer + 16 ] = cy
            baseVertices[ baseVerticesPointer + 17 ] = azb
            baseVerticesPointer += 18
          }
        }
        // left side below opening
        if (pointer <= 0) {
          // start face of the wall if opening is at x = 0
          // left side quad vertices below opening
          // react to opening z-position
          if (azf > cz) {
            if (c.y > baseHeightFront) {
              frontVertices[ frontVerticesPointer ] = frontVertices[ frontVerticesPointer + 9 ] = pointer
              frontVertices[ frontVerticesPointer + 1 ] = frontVertices[ frontVerticesPointer + 10 ] = baseHeightFront
              frontVertices[ frontVerticesPointer + 2 ] = frontVertices[ frontVerticesPointer + 11 ] = cz
              frontVertices[ frontVerticesPointer + 3 ] = pointer
              frontVertices[ frontVerticesPointer + 4 ] = baseHeightFront
              frontVertices[ frontVerticesPointer + 5 ] = azf
              frontVertices[ frontVerticesPointer + 6 ] = frontVertices[ frontVerticesPointer + 12 ] = pointer
              frontVertices[ frontVerticesPointer + 7 ] = frontVertices[ frontVerticesPointer + 13 ] = cy
              frontVertices[ frontVerticesPointer + 8 ] = frontVertices[ frontVerticesPointer + 14 ] = azf
              frontVertices[ frontVerticesPointer + 15 ] = pointer
              frontVertices[ frontVerticesPointer + 16 ] = cy
              frontVertices[ frontVerticesPointer + 17 ] = cz
              frontVerticesPointer += 18
              // left side quad uvs
              frontUvs[ frontUvsPointer ] = frontUvs[ frontUvsPointer + 6 ] = 0
              frontUvs[ frontUvsPointer + 1 ] = frontUvs[ frontUvsPointer + 7 ] = baseHeightFront
              frontUvs[ frontUvsPointer + 2 ] = aw
              frontUvs[ frontUvsPointer + 3 ] = baseHeightFront
              frontUvs[ frontUvsPointer + 4 ] = frontUvs[ frontUvsPointer + 8 ] = aw
              frontUvs[ frontUvsPointer + 5 ] = frontUvs[ frontUvsPointer + 9 ] = cy
              frontUvs[ frontUvsPointer + 10 ] = 0
              frontUvs[ frontUvsPointer + 11 ] = cy
              frontUvsPointer += 12
            }
            // left side baseboard quad vertices
            if (baseHeightFront) {
              baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
              baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = 0
              baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = cz
              baseVertices[ baseVerticesPointer + 3 ] = pointer
              baseVertices[ baseVerticesPointer + 4 ] = 0
              baseVertices[ baseVerticesPointer + 5 ] = azf
              baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer
              baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = baseHeightFrontBelow
              baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = azf
              baseVertices[ baseVerticesPointer + 15 ] = pointer
              baseVertices[ baseVerticesPointer + 16 ] = baseHeightFrontBelow
              baseVertices[ baseVerticesPointer + 17 ] = cz
              baseVerticesPointer += 18
            }
          }
          if (cz > azb) {
            if (c.y > baseHeightBack) {
              backVertices[ backVerticesPointer ] = backVertices[ backVerticesPointer + 9 ] = pointer
              backVertices[ backVerticesPointer + 1 ] = backVertices[ backVerticesPointer + 10 ] = baseHeightBack
              backVertices[ backVerticesPointer + 2 ] = backVertices[ backVerticesPointer + 11 ] = azb
              backVertices[ backVerticesPointer + 3 ] = pointer
              backVertices[ backVerticesPointer + 4 ] = baseHeightBack
              backVertices[ backVerticesPointer + 5 ] = cz
              backVertices[ backVerticesPointer + 6 ] = backVertices[ backVerticesPointer + 12 ] = pointer
              backVertices[ backVerticesPointer + 7 ] = backVertices[ backVerticesPointer + 13 ] = cy
              backVertices[ backVerticesPointer + 8 ] = backVertices[ backVerticesPointer + 14 ] = cz
              backVertices[ backVerticesPointer + 15 ] = pointer
              backVertices[ backVerticesPointer + 16 ] = cy
              backVertices[ backVerticesPointer + 17 ] = azb
              backVerticesPointer += 18
              // left side quad uvs
              backUvs[ backUvsPointer ] = backUvs[ backUvsPointer + 6 ] = 0
              backUvs[ backUvsPointer + 1 ] = backUvs[ backUvsPointer + 7 ] = baseHeightBack
              backUvs[ backUvsPointer + 2 ] = aw
              backUvs[ backUvsPointer + 3 ] = baseHeightBack
              backUvs[ backUvsPointer + 4 ] = backUvs[ backUvsPointer + 8 ] = aw
              backUvs[ backUvsPointer + 5 ] = backUvs[ backUvsPointer + 9 ] = cy
              backUvs[ backUvsPointer + 10 ] = 0
              backUvs[ backUvsPointer + 11 ] = cy
              backUvsPointer += 12
            }
            // left side baseboard quad vertices
            if (baseHeightBack) {
              baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
              baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = 0
              baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = azb
              baseVertices[ baseVerticesPointer + 3 ] = pointer
              baseVertices[ baseVerticesPointer + 4 ] = 0
              baseVertices[ baseVerticesPointer + 5 ] = cz
              baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer
              baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = baseHeightBackBelow
              baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = cz
              baseVertices[ baseVerticesPointer + 15 ] = pointer
              baseVertices[ baseVerticesPointer + 16 ] = baseHeightBackBelow
              baseVertices[ baseVerticesPointer + 17 ] = azb
              baseVerticesPointer += 18
            }
          }
        } else if (cPrev && cx === round(cPrev.x + cPrev.l) && cPrev.y < cy) {
          // adjacent to a window
          _yf = cy > baseHeightFront ? baseHeightFront : cy
          _yb = cy > baseHeightBack ? baseHeightBack : cy
          // left side quad vertices
          // if previous opening is higher
          if (azf > cz) {
            // react to opening z-position
            if (c.y > baseHeightFront) {
              frontVertices[ frontVerticesPointer ] = frontVertices[ frontVerticesPointer + 9 ] = pointer
              frontVertices[ frontVerticesPointer + 1 ] = frontVertices[ frontVerticesPointer + 10 ] = _yf
              frontVertices[ frontVerticesPointer + 2 ] = frontVertices[ frontVerticesPointer + 11 ] = cz
              frontVertices[ frontVerticesPointer + 3 ] = pointer
              frontVertices[ frontVerticesPointer + 4 ] = _yf
              frontVertices[ frontVerticesPointer + 5 ] = azf
              frontVertices[ frontVerticesPointer + 6 ] = frontVertices[ frontVerticesPointer + 12 ] = pointer
              frontVertices[ frontVerticesPointer + 7 ] = frontVertices[ frontVerticesPointer + 13 ] = cy
              frontVertices[ frontVerticesPointer + 8 ] = frontVertices[ frontVerticesPointer + 14 ] = azf
              frontVertices[ frontVerticesPointer + 15 ] = pointer
              frontVertices[ frontVerticesPointer + 16 ] = cy
              frontVertices[ frontVerticesPointer + 17 ] = cz
              frontVerticesPointer += 18
              // left side quad uvs
              frontUvs[ frontUvsPointer ] = frontUvs[ frontUvsPointer + 6 ] = 0
              frontUvs[ frontUvsPointer + 1 ] = frontUvs[ frontUvsPointer + 7 ] = _yf
              frontUvs[ frontUvsPointer + 2 ] = aw
              frontUvs[ frontUvsPointer + 3 ] = _yf
              frontUvs[ frontUvsPointer + 4 ] = frontUvs[ frontUvsPointer + 8 ] = aw
              frontUvs[ frontUvsPointer + 5 ] = frontUvs[ frontUvsPointer + 9 ] = cy
              frontUvs[ frontUvsPointer + 10 ] = 0
              frontUvs[ frontUvsPointer + 11 ] = cy
              frontUvsPointer += 12
            }
            // left side base quad vertices
            if (baseHeightFront && cPrev.y < baseHeightFront) {
              baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
              baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = cPrev.y
              baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = cz
              baseVertices[ baseVerticesPointer + 3 ] = pointer
              baseVertices[ baseVerticesPointer + 4 ] = cPrev.y
              baseVertices[ baseVerticesPointer + 5 ] = azf
              baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer
              baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = _yf
              baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = azf
              baseVertices[ baseVerticesPointer + 15 ] = pointer
              baseVertices[ baseVerticesPointer + 16 ] = _yf
              baseVertices[ baseVerticesPointer + 17 ] = cz
              baseVerticesPointer += 18
            }
          }
          if (cz > azb) {
            if ( c.y > baseHeightBack) {
              backVertices[ backVerticesPointer ] = backVertices[ backVerticesPointer + 9 ] = pointer
              backVertices[ backVerticesPointer + 1 ] = backVertices[ backVerticesPointer + 10 ] = _yb
              backVertices[ backVerticesPointer + 2 ] = backVertices[ backVerticesPointer + 11 ] = azb
              backVertices[ backVerticesPointer + 3 ] = pointer
              backVertices[ backVerticesPointer + 4 ] = _yb
              backVertices[ backVerticesPointer + 5 ] = cz
              backVertices[ backVerticesPointer + 6 ] = backVertices[ backVerticesPointer + 12 ] = pointer
              backVertices[ backVerticesPointer + 7 ] = backVertices[ backVerticesPointer + 13 ] = cy
              backVertices[ backVerticesPointer + 8 ] = backVertices[ backVerticesPointer + 14 ] = cz
              backVertices[ backVerticesPointer + 15 ] = pointer
              backVertices[ backVerticesPointer + 16 ] = cy
              backVertices[ backVerticesPointer + 17 ] = azb
              backVerticesPointer += 18
              // left side quad uvs
              backUvs[ backUvsPointer ] = backUvs[ backUvsPointer + 6 ] = 0
              backUvs[ backUvsPointer + 1 ] = backUvs[ backUvsPointer + 7 ] = _yb
              backUvs[ backUvsPointer + 2 ] = aw
              backUvs[ backUvsPointer + 3 ] = _yb
              backUvs[ backUvsPointer + 4 ] = backUvs[ backUvsPointer + 8 ] = aw
              backUvs[ backUvsPointer + 5 ] = backUvs[ backUvsPointer + 9 ] = cy
              backUvs[ backUvsPointer + 10 ] = 0
              backUvs[ backUvsPointer + 11 ] = cy
              backUvsPointer += 12
            }
            // left side base quad vertices
            if (baseHeightBack && cPrev.y < baseHeightBack) {
              baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer
              baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = cPrev.y
              baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = azb
              baseVertices[ baseVerticesPointer + 3 ] = pointer
              baseVertices[ baseVerticesPointer + 4 ] = cPrev.y
              baseVertices[ baseVerticesPointer + 5 ] = cz
              baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer
              baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = _yb
              baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = cz
              baseVertices[ baseVerticesPointer + 15 ] = pointer
              baseVertices[ baseVerticesPointer + 16 ] = _yb
              baseVertices[ baseVerticesPointer + 17 ] = azb
              baseVerticesPointer += 18
            }
          }
        }

        // right side below opening
        // end face of the wall if opening hits end of wall
        if (round(pointer + cl) >= al) {
          // right side quad vertices
          if (azf > cz) {
            if (c.y > baseHeightFront) {
              // react to opening z-position
              frontVertices[ frontVerticesPointer ] = frontVertices[ frontVerticesPointer + 9 ] = pointer + cl
              frontVertices[ frontVerticesPointer + 1 ] = frontVertices[ frontVerticesPointer + 10 ] = baseHeightFront
              frontVertices[ frontVerticesPointer + 2 ] = frontVertices[ frontVerticesPointer + 11 ] = azf
              frontVertices[ frontVerticesPointer + 3 ] = pointer + cl
              frontVertices[ frontVerticesPointer + 4 ] = baseHeightFront
              frontVertices[ frontVerticesPointer + 5 ] = cz
              frontVertices[ frontVerticesPointer + 6 ] = frontVertices[ frontVerticesPointer + 12 ] = pointer + cl
              frontVertices[ frontVerticesPointer + 7 ] = frontVertices[ frontVerticesPointer + 13 ] = cy
              frontVertices[ frontVerticesPointer + 8 ] = frontVertices[ frontVerticesPointer + 14 ] = cz
              frontVertices[ frontVerticesPointer + 15 ] = pointer + cl
              frontVertices[ frontVerticesPointer + 16 ] = cy
              frontVertices[ frontVerticesPointer + 17 ] = azf
              frontVerticesPointer += 18
              // right side quad uvs
              frontUvs[ frontUvsPointer ] = frontUvs[ frontUvsPointer + 6 ] = aw
              frontUvs[ frontUvsPointer + 1 ] = frontUvs[ frontUvsPointer + 7 ] = baseHeightFront
              frontUvs[ frontUvsPointer + 2 ] = 0
              frontUvs[ frontUvsPointer + 3 ] = baseHeightFront
              frontUvs[ frontUvsPointer + 4 ] = frontUvs[ frontUvsPointer + 8 ] = 0
              frontUvs[ frontUvsPointer + 5 ] = frontUvs[ frontUvsPointer + 9 ] = cy
              frontUvs[ frontUvsPointer + 10 ] = aw
              frontUvs[ frontUvsPointer + 11 ] = cy
              frontUvsPointer += 12
            }
            if (baseHeightFront) {
              // right side base quad vertices
              baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer + cl
              baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = 0
              baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = azf
              baseVertices[ baseVerticesPointer + 3 ] = pointer + cl
              baseVertices[ baseVerticesPointer + 4 ] = 0
              baseVertices[ baseVerticesPointer + 5 ] = cz
              baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer + cl
              baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = baseHeightFrontBelow
              baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = cz
              baseVertices[ baseVerticesPointer + 15 ] = pointer + cl
              baseVertices[ baseVerticesPointer + 16 ] = baseHeightFrontBelow
              baseVertices[ baseVerticesPointer + 17 ] = azf
              baseVerticesPointer += 18
            }
          }

          if (cz > azb) {
            if (c.y > baseHeightBack) {
              backVertices[ backVerticesPointer ] = backVertices[ backVerticesPointer + 9 ] = pointer + cl
              backVertices[ backVerticesPointer + 1 ] = backVertices[ backVerticesPointer + 10 ] = baseHeightBack
              backVertices[ backVerticesPointer + 2 ] = backVertices[ backVerticesPointer + 11 ] = cz
              backVertices[ backVerticesPointer + 3 ] = pointer + cl
              backVertices[ backVerticesPointer + 4 ] = baseHeightBack
              backVertices[ backVerticesPointer + 5 ] = azb
              backVertices[ backVerticesPointer + 6 ] = backVertices[ backVerticesPointer + 12 ] = pointer + cl
              backVertices[ backVerticesPointer + 7 ] = backVertices[ backVerticesPointer + 13 ] = cy
              backVertices[ backVerticesPointer + 8 ] = backVertices[ backVerticesPointer + 14 ] = azb
              backVertices[ backVerticesPointer + 15 ] = pointer + cl
              backVertices[ backVerticesPointer + 16 ] = cy
              backVertices[ backVerticesPointer + 17 ] = cz
              backVerticesPointer += 18
              // right side quad uvs
              backUvs[ backUvsPointer ] = backUvs[ backUvsPointer + 6 ] = aw
              backUvs[ backUvsPointer + 1 ] = backUvs[ backUvsPointer + 7 ] = baseHeightBack
              backUvs[ backUvsPointer + 2 ] = 0
              backUvs[ backUvsPointer + 3 ] = baseHeightBack
              backUvs[ backUvsPointer + 4 ] = backUvs[ backUvsPointer + 8 ] = 0
              backUvs[ backUvsPointer + 5 ] = backUvs[ backUvsPointer + 9 ] = cy
              backUvs[ backUvsPointer + 10 ] = aw
              backUvs[ backUvsPointer + 11 ] = cy
              backUvsPointer += 12
            }
            if (baseHeightBack) {
              // right side base quad vertices
              baseVertices[ baseVerticesPointer ] = baseVertices[ baseVerticesPointer + 9 ] = pointer + cl
              baseVertices[ baseVerticesPointer + 1 ] = baseVertices[ baseVerticesPointer + 10 ] = 0
              baseVertices[ baseVerticesPointer + 2 ] = baseVertices[ baseVerticesPointer + 11 ] = cz
              baseVertices[ baseVerticesPointer + 3 ] = pointer + cl
              baseVertices[ baseVerticesPointer + 4 ] = 0
              baseVertices[ baseVerticesPointer + 5 ] = azb
              baseVertices[ baseVerticesPointer + 6 ] = baseVertices[ baseVerticesPointer + 12 ] = pointer + cl
              baseVertices[ baseVerticesPointer + 7 ] = baseVertices[ baseVerticesPointer + 13 ] = baseHeightBackBelow
              baseVertices[ baseVerticesPointer + 8 ] = baseVertices[ baseVerticesPointer + 14 ] = azb
              baseVertices[ baseVerticesPointer + 15 ] = pointer + cl
              baseVertices[ baseVerticesPointer + 16 ] = baseHeightBackBelow
              baseVertices[ baseVerticesPointer + 17 ] = cz
              baseVerticesPointer += 18
            }
          }
        } else if (cNext && round(cx + cl) === cNext.x && cNext.y < cy) {
          // adjacent to a window
          // right side quad vertices
          // if next window is higher
          _yf = cy > baseHeightFront ? baseHeightFront : cy
          _yb = cy > baseHeightBack ? baseHeightBack : cy
          // react to opening z-position
          if (azf > cz) {
            if (c.y > baseHeightFront) {
              frontVertices[ frontVerticesPointer ] = frontVertices[ frontVerticesPointer + 9 ] = pointer + cl
              frontVertices[ frontVerticesPointer + 1 ] = frontVertices[ frontVerticesPointer + 10 ] = cy
              frontVertices[ frontVerticesPointer + 2 ] = frontVertices[ frontVerticesPointer + 11 ] = azf
              frontVertices[ frontVerticesPointer + 3 ] = pointer + cl
              frontVertices[ frontVerticesPointer + 4 ] = _yf
              frontVertices[ frontVerticesPointer + 5 ] = azf
              frontVertices[ frontVerticesPointer + 6 ] = frontVertices[ frontVerticesPointer + 12 ] = pointer + cl
              frontVertices[ frontVerticesPointer + 7 ] = frontVertices[ frontVerticesPointer + 13 ] = _yf
              frontVertices[ frontVerticesPointer + 8 ] = frontVertices[ frontVerticesPointer + 14 ] = cz
              frontVertices[ frontVerticesPointer + 15 ] = pointer + cl
              frontVertices[ frontVerticesPointer + 16 ] = cy
              frontVertices[ frontVerticesPointer + 17 ] = cz
              frontVerticesPointer += 18
              // right side quad uvs
              frontUvs[ frontUvsPointer ] = frontUvs[ frontUvsPoin