io3fix/src/utils/data3d/buffer/get-uvs.js

toolkit for interior apps

// methods

function projectAxisY (v) {

  var uvs = new Float32Array(v.length / 1.5)
  var uvPos = 0

  var i, l
  for (i = 0, l = v.length; i < l; i += 9) {

    uvs[uvPos] = v[i + 2]
    uvs[uvPos + 1] = v[i]
    uvs[uvPos + 2] = v[i + 5]
    uvs[uvPos + 3] = v[i + 3]
    uvs[uvPos + 4] = v[i + 8]
    uvs[uvPos + 5] = v[i + 6]
    uvPos += 6

  }

  return uvs

}
projectAxisY.title = 'Project Top Down'

function architectural (v) {

  var uvs = new Float32Array(v.length / 1.5)
  var uvPos = 0

  var i, l, n, components
  for (i = 0, l = v.length; i < l; i += 9) {

    // calculate face normal
    // cross product (a-b) x (c-b)
    n = [
      (v[i + 7] - v[i + 4]) * (v[i + 2] - v[i + 5]) - (v[i + 8] - v[i + 5]) * (v[i + 1] - v[i + 4]),
      (v[i + 8] - v[i + 5]) * (v[i] - v[i + 3]) - (v[i + 6] - v[i + 3]) * (v[i + 2] - v[i + 5]),
      (v[i + 6] - v[i + 3]) * (v[i + 1] - v[i + 4]) - (v[i + 7] - v[i + 4]) * (v[i] - v[i + 3])
    ]

    // normals should be absolute
    if (n[0] < 0) {
      n[0] *= -1
    }
    if (n[1] < 0) {
      n[1] *= -1
    }
    if (n[2] < 0) {
      n[2] *= -1
    }

    // highest first?
    components = [1, 0, 2].sort(function (a, b) {
      return n[a] - n[b]
    })

    uvs[uvPos] = v[i + components[1]]
    uvs[uvPos + 1] = v[i + components[0]]
    uvs[uvPos + 2] = v[i + 3 + components[1]]
    uvs[uvPos + 3] = v[i + 3 + components[0]]
    uvs[uvPos + 4] = v[i + 6 + components[1]]
    uvs[uvPos + 5] = v[i + 6 + components[0]]
    uvPos += 6

  }

  return uvs

}
architectural.title = 'Architectural'

// API

var getUvsBuffer = {
  architectural: architectural,
  projectAxisY: projectAxisY
}

export default getUvsBuffer