Hi,
I have a monotone function y=(x) defined as spline (it describes the position of
an object in the scene), and I need to find its root, i.e. where it crosses x
axis. Is there any elegant way to do this inside povray? Maybe I could transform
the function in a prism surface, and using "trace" to find the intersection of a
ray at height y=0 with the surface. Other ideas?

Thanks!
igmar

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