beam division

[Hao-HUST]

Hi.

Thanks for sharing your great work on Github.

I am not familiar with the beam tracing, now I have some implementation problems to seek your help:

The beam is defined as the combination of origin vertex and three light directions:

1. I need to test whether the 3D triangular mesh is hit by the beam or not ( Occlusion detection).
2. And then, if the mesh is hit, the original beam should be divided into several new beams with the same structure(beam division), and the shadow region should be clipped(beam clip).

Is there any clue on your code for my task?