trace VEX function
Sends a ray from P along the normalized vector D.
void trace(vector cv&, vector of&, float af&, vector P, vector D, float shadow_bias, float max_contrib)
Sends a ray from P along the normalized vector D. The resulting color, opacity and alpha will be put in the export variables.
shadow_bias is typically a small number which is used to prevent self-shading.
max_contrib controls how much the result of the trace() call will contribute to the resulting pixel color. max_contrib has no effect on the results of the trace() call.
See optional parameters .
When hit testing polygons you can get lots of rays missing. In these cases triangulating the geometry can improves hits.