Triangle/Ray Intersection

Fast vectorized triangle/ray intersection algorithm

Description

Ray/triangle intersection using the algorithm proposed by Möller and
Trumbore (1997), implemented as highly vectorized MATLAB code.

 Input (all arrays in in Nx3, where N is number of vertices or rays):
   orig : ray's origin
   dir : ray's direction
   vert0, vert1, vert2: vertices of the triangle
   options: aditional customization options
     options.epsilon (default = 1e-5)
     options.triangle - 'one sided' or 'two sided' (default) - how to treat
       triangles. In 'one sided' version only intersections in single
       direction are counted and intersections with back facing
          tringles are ignored
     options.ray - 'ray' (default) or 'segment' - how to treat ray as an
     infinite line (ray) or as line segment defined by a vector

 Output:
   Intersect - boolean array of length N
   t - distance from the ray origin to the intersection point in |dir|
   u,v - barycentric coordinates of the intersection point
   units

Acknowledgements

Ray/Triangle Intersection inspired this file.

• MATLAB release: MATLAB 7.12 (R2011a)

[Ben]

Looks great. Downloaded and will try it later.

[Jaroslaw Tuszynski]

Re to Anton Semechko: This is a low level function which can be called with one ray and many faces, many faces and one ray or many faces and rays. It is quite simple to apply repmat function to the inputs.

[Anton Semechko]

why does the number of rays have to equal the number of faces? that's so inconvenient