Pyembree ray.intersects_location(): Border intersections are not detected

[Ludwig-Graef]

Hi,
I encountered the issue that a ray can pass through two adjacent triangles without being detected by ray.intersects_location(). Using here ray.ray_pyembree.RayMeshIntersector().
Find example below:

def test_between_triangles(self):\n
    mesh = trimesh.Trimesh(vertices=[[-1, -1, 0], [-1, 1, 0], [1, 1, 0], [1, -1, 0]], faces=[(0, 1, 2), (2, 3, 0)])
    ray_origin, ray_direction = np.array([[0, 0, 1]]), np.array([[ 0,  0, -1]])
    pts_xyz, _, _ = mesh.ray.intersects_location(ray_origin, ray_direction, multiple_hits=False)
    assert len(pts_xyz) == 1, 'No intersection found on the edge between the two triangles'

I figured out, that if you do not scale the scene/ray, this error does not occur.

   ray_mesh_intersector = trimesh.ray.ray_pyembree.RayMeshIntersector(mesh, scale_to_box=False)
   pt_xyz, _, _ = ray_mesh_intersector.intersects_location(ray_origin, ray_direction)

Is this issue already solved/adressed?

Thanks for helping out.

Tried versions:

• Multiple Ubuntu versions: 20.04, 22.04
• Python 3.8.13
• Trimesh 3.16.0
• Pyembree 0.2.11

[mikedh]

Hey, yeah unfortunately I think this is #242 which may be mitigated by finally upgrading to embree3 in the long-neglected #1108