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3D OutlineExtractor doesn't work with polyhedrons with holes #45

maisonobe opened this issue Sep 11, 2018 · 0 comments

3D OutlineExtractor doesn't work with polyhedrons with holes #45

maisonobe opened this issue Sep 11, 2018 · 0 comments


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@maisonobe maisonobe commented Sep 11, 2018

This test case fails. The 3D shape is a cube with square holes drilled along each axis.
The outline extracted when looking along the Z axis is empty, whereas it should be a big square
with a square hole in the middle.

public void testHolesInFacet() {
    double tolerance = 1.0e-10;
    PolyhedronsSet cube       = new PolyhedronsSet(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0, tolerance);
    PolyhedronsSet tubeAlongX = new PolyhedronsSet(-2.0, 2.0, -0.5, 0.5, -0.5, 0.5, tolerance);
    PolyhedronsSet tubeAlongY = new PolyhedronsSet(-0.5, 0.5, -2.0, 2.0, -0.5, 0.5, tolerance);
    PolyhedronsSet tubeAlongZ = new PolyhedronsSet(-0.5, 0.5, -0.5, 0.5, -2.0, 2.0, tolerance);
    RegionFactory<Euclidean3D> factory = new RegionFactory<>();
    PolyhedronsSet cubeWithHoles = (PolyhedronsSet) factory.difference(cube,
                                                                                     factory.union(tubeAlongY, tubeAlongZ)));
    Assert.assertEquals(4.0, cubeWithHoles.getSize(), 1.0e-10);
    Vector2D[][] outline = new OutlineExtractor(Vector3D.PLUS_I, Vector3D.PLUS_J).getOutline(cubeWithHoles);
    Assert.assertEquals(2, outline.length);
    Assert.assertEquals(4, outline[0].length);
    Assert.assertEquals(4, outline[1].length);
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