Lutz Kretzschmar wrote:
> 
> If the rays are not parallel and contrained by a cylinder, how is this
> different from a spotlight constrained by a cone?
> Does this mean that the area illuminated by the light is the same no
> matter how far away the surface is? If so, then why do the docs say
> that the rays are not parallel?
> 
	It does mean that the area illuminated by the light is the same no
matter how far away the surface is. However, the rays are not parrallel:
the shadow of an object is the same as if you had a pointlight (or a
spotlight), that is bigger when farther away whereas true parallel rays
would make the same shadow no matter what distance the object is from
the light position and shadow position. Nathan Kopp's uvpov includes a
patch for true cylindrical light (Idon't know about the superpatch).

		Jerome

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