@Test
public void testIntersectsTriangle() {
final Vector3 v0 = new Vector3(-1, -1, -1);
final Vector3 v1 = new Vector3(+1, -1, -1);
final Vector3 v2 = new Vector3(+1, +1, -1);
final Vector3 intersectionPoint = new Vector3();
// inside triangle
Ray3 pickRay = new Ray3(new Vector3(0.5, -0.5, 3), new Vector3(0, 0, -1));
assertTrue(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// horizontal edge
pickRay = new Ray3(new Vector3(0, -1, 3), new Vector3(0, 0, -1));
assertTrue(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// diagonal edge
pickRay = new Ray3(new Vector3(0, 0, 3), new Vector3(0, 0, -1));
assertTrue(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// vertical edge
pickRay = new Ray3(new Vector3(+1, 0, 3), new Vector3(0, 0, -1));
assertTrue(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// v0
pickRay = new Ray3(new Vector3(-1, -1, 3), new Vector3(0, 0, -1));
assertTrue(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// v1
pickRay = new Ray3(new Vector3(+1, -1, 3), new Vector3(0, 0, -1));
assertTrue(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// v2
pickRay = new Ray3(new Vector3(1, 1, 3), new Vector3(0, 0, -1));
assertTrue(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// outside horizontal edge
pickRay = new Ray3(new Vector3(0, -1.1, 3), new Vector3(0, 0, -1));
assertFalse(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// outside diagonal edge
pickRay = new Ray3(new Vector3(-0.1, 0.1, 3), new Vector3(0, 0, -1));
assertFalse(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// outside vertical edge
pickRay = new Ray3(new Vector3(+1.1, 0, 3), new Vector3(0, 0, -1));
assertFalse(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// inside triangle but ray pointing other way
pickRay = new Ray3(new Vector3(-0.5, -0.5, 3), new Vector3(0, 0, +1));
assertFalse(pickRay.intersectsTriangle(v0, v1, v2, intersectionPoint));
// test distance
pickRay = new Ray3(new Vector3(0.5, -0.5, 3), new Vector3(0, 0, -1));
assertTrue(4.0 == pickRay.getDistanceToPrimitive(new Vector3[] {v0, v1, v2}));
// test intersect planar
assertTrue(pickRay.intersectsTrianglePlanar(v0, v1, v2, intersectionPoint));
}
