@jscad/modeling/src/connectors/transformationBetween.test.js

Constructive Solid Geometry (CSG) Library for JSCAD

const test = require('ava')

const { transformationBetween, create, fromPointAxisNormal } = require('./index')

const { compareVectors } = require('../../test/helpers')

test('connector: transformationBetween() should return correct transform matrices', (t) => {
  const connector1 = create()
  const connector2 = create()
  const connector3 = fromPointAxisNormal([0, 0, 0], [0, 0, 1], [0, 1, 0]) // Y axis as normal

  let obs = transformationBetween({}, connector1, connector2)
  let exp = [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]
  t.true(compareVectors(obs, exp))

  obs = transformationBetween({}, connector1, connector3)
  exp = [0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]
  t.true(compareVectors(obs, exp))

  // connectors as taken from V1 cube
  const facecenter0 = fromPointAxisNormal([3, 0, 0], [1, 0, 0], [0, 0, 1])
  const facecenter1 = fromPointAxisNormal([-3, 0, 0], [-1, 0, 0], [0, 0, 1])
  const facecenter2 = fromPointAxisNormal([0, 3, 0], [0, 1, 0], [0, 0, 1])
  // const facecenter3 = fromPointAxisNormal([0, -3, 0], [0, -1, 0], [0, 0, 1])
  // const facecenter4 = fromPointAxisNormal([0, 0, 3], [0, 0, 1], [1, 0, 0])
  const facecenter5 = fromPointAxisNormal([0, 0, -3], [0, 0, -1], [1, 0, 0])

  obs = transformationBetween({}, facecenter0, facecenter1) // opposing faces
  exp = [-1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0, 0, -3.6739405577555036e-16, 0, 1]
  t.true(compareVectors(obs, exp))

  obs = transformationBetween({}, facecenter2, facecenter5) // adjacent faces
  exp = [0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, 0, 3, -3, 0, 1]
  t.true(compareVectors(obs, exp))

  // test mirror option
  obs = transformationBetween({ mirror: true }, facecenter0, facecenter1) // opposing faces
  exp = [1, -2.4492937051703357e-16, 0, 0, 2.4492937051703357e-16, 1, 0, 0, 0, 0, 1, 0, -6, 7.347881115511007e-16, 0, 1]
  t.true(compareVectors(obs, exp))
})