troubleshooting Question

Z-index of point on a polygon

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InteractiveMindFlag for United Kingdom of Great Britain and Northern Ireland asked on
Math / Science
12 Comments1 Solution300 ViewsLast Modified:
I've got a polygon defined by an array of vectors:

  Vector3 [] v ;
  .

Given the x and y coordinates of a point on the surface, I need to find the corresponding z coordinate.

Perhaps cast a vector from (x,y,0) in the direction of (0,0,-1), and then find how far it travels prior to hitting the surface.

I need the fastest solution - with as little overhead as possible, as I'm likely to be performing this operation potentially tens of thousands of times per second (if not more)..

Thanks very much.
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