Hi Brian,
in order to see the light beam and the rainbow colors, volumetrics (for the scene)
and dispersion (for the prism) is enabled. Thea is one of the very few render engines
who can do this stuff and according to their slogan is physically accurate.
The prism (made in MoI) is flat on all sides and filleted at the edges. I used this form
of a prism to see how it compares to the Pink Floyd Album Cover The Dark Side of The
Moon. Maybe they used for their illustration a regular tetrahedron, rotated at a certain
angle, i don't know.
Best regards
Stefan
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