Hi Matt,

because you asked in the advanced-users group,
I assume short answers will suffice ;-)

First question:
   You are actually asking for the normal of an object at v1: use trace()
   to shoot a ray at v1 and get the normal (your v2) at this point.
   (look for trace at "6.1.4.6 Vector Functions")

Second question:
   The Advanced Tutorial ("4.2 POV-Ray SDL tutorial: A raytracer")
   should give you some hints, esp. "4.2.3 Short introduction to
   raytracing" and "4.2.7 Ray-sphere intersection"


Sputnik

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