This is a very important vex function to check intersections between primitives
int intersect(geometry, orig, dir, &p, &uvw)
You provide geometry, origin position and direction of vector checking the intersection and the function will return the intersection position in &p and uv of that prim in &uvw. It will also return 0 if an intersection was detected and -1 if not.
Heres an example where I am checking a scaling normal hitting a bunch of primitives. Once a primitive is hit (returns 0), I change its color to yellow.
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hip file: vex_intersect_setup_001.zip
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