Oriented ray-mesh intersection

[asml]

Hi Michael,

one more question: If I have a list of outward facing normals for each triangle, can I use pyoctree to calculate not just the ray-mesh intersection point but also from which side the ray hit the triangle? I could do that myself if I were able to get the index of the triangle the ray intersects with instead of the exact intersection point.

Thanks,
Andreas

Edit: I think this should be possible using "getListOfPolysToCheck". Unfortunately, the call does not return to Python for certain inputs (infinite loop in the C-implementation?).

[mhogg]

Hi Andreas,
I just created a new version that exposes the label of the intersected tris. See https://github.com/mhogg/pyoctree/releases/tag/v0.2.5_rc1. Note that this includes a Python 3.6 wheel (not sure what you are using) and a Jupyter notebook that demos how the new change can be used. Let me know if this solves your issue.
Cheers,
Michael

[asml]

Great, thanks a lot! That's exactly what I need :)
I'm on MacOS High Sierra and had to make a few changes. Might be useful to others:

1. Compile with gcc [clang resulted in "Expected in: flat namespace" during import]:
   export CC=gcc-7
   export CXX=g++-7

2. Update cython to 0.28 [0.26 resulted in "no attribute reduce_cython" during import]:
   pip install -upgrade cython

3. Change LINK_ARGS in setup.py [original version resulted in "Symbol not found: _GOMP_parallel)"]:
   LINK_ARGS['unix'] = ['-lgomp','-Wl,-rpath,/usr/local/Cellar/gcc/7.3.0/lib/gcc/7/']

"/usr/local/Cellar/gcc/7.3.0/lib/gcc/7/" is where my "libgomp.1.dylib" is located.

Cheers,
Andreas