Orchid XP v3 nous apporta ses lumieres en ce 04/10/2006 13:55:
>> I was wondering (and have experimented and failed) whether you could 
>> have a
>> completely invisible object in the scene that specularly reflects light.
>>
>> For instance say you have a red sphere of radius 1, an invisible
>> dodecahedron of radius 1.1, and a few multi-colored spotlights.
>>
>> Can you make it so the reflections shown on the ground and walls come 
>> from
>> the dodecahedron's surface without actually seeing the dodecahedron, and
>> all you see is the sphere which seems to be making the dodecahedron
>> reflections?
>>
>> Thanks for any help!
Have the dodecaedron have no_image to make it invisible. Give it a photons block 
with target on reflection on.
Give one or the other no_shadow, depending on what shadow you want.
If you have reflective surfaces showing the sphere, give the dodecaedron 
no_reflection to remove it's reflection.

> 
> Check out no_image, no_shadow and no_reflect.
> 
> Also, if you're shining a spotlight on the thing and expecting to see 
> spots of light all over the place, you'll be needing photons to do that. 
> What you could do (not sure if it will work properly) is run POV-Ray 
> once with the object there as normal (to generate the photon map), and 
> then run POV-Ray again with the same photon map but with the object 
> removed. or replaced.
That trick does work, and have been used to good effect.

-- 
Alain
-------------------------------------------------
Celebrate Hannibal Day this year.  Take an elephant to lunch.

Post a reply to this message