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Robert J Becraft wrote in message <36C### [at] aol com>...
>
>I would like to see something that allowed me to define a heightfield as a
>CSG, then using that as a target, create a function that given an X,Z
>coordinate in the heightfield would return the Y value for that point.
>This out of all the modifications that could be made to POV would be the
>greatest improvement in my mind.
>
>Imagine,all those people who have contributed grass renders... you take
your
>grass stalks and place them approriately on a gently rolling heightfield.
>Every one of them is placed at the right height irregardless of the point
on
>the heightfield it is generated.
>
Unless you are opposed to using an unofficial compile of POV, I suggest you
get the Superpatch. It has a trace() function that does what you want.
Example:
trace(MyHeightField,StartPoint,Dir,Normal);
This traces a ray from StartPoint in direction Dir and if MyHeightField is
hit, returns the intersection point. It also stores the surface normal of
that point in a pre-declared identifier "Normal", if it's provided.
I have found this function incredibly useful; my "shaggy" images were made
using it.
Margus
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