As part of an optics drawing package, I want to simulate a point object
being focused by a lens onto an image point, i.e. the 3D equivalent of a
ray diagram. So what I need is a cone of light. Please note that I am
not using photons (that might come later).
My problem is to choose the correct lighting, texture, interior, etc,
for the light cone. Here are some of the specifications that I can think
of for the cone:
1. Must not cast shadow
2. Must not show shadow of other objects.
3. Should allow different coloring, e.g. blue light, red light, etc.
I have uploaded my trial pov file, and the result, as follows:
I would appreciate any comments or hints.
(By the way, feel free to download the povray documentation in pdf form,
in the same directory.)