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Le 17-11-08 à 08:27, William F Pokorny a écrit :
> On 11/08/2017 07:36 AM, Thomas de Groot wrote:
>> Consider the following setup:
>>
>> - a camera
>> - an object in front of the camera
>> - a solid/non-transparant wall behind the object
>> - a light_source behind the wall
>>
>> Now, for some arcane reason, I want the light_source to shine on the
>> object while the wall remains visible to the camera.
>>
>> I first thought of a light_group {} with object and light_source in
>> it, but the wall still blocks the light.
>>
>> Any smart idea? I am sure it should be possible and I have the nagging
>> feeling that it has been done before.
>>
> Have you tried the no_shadow object qualifier on your wall object?
>
> If no_shadow cannot be used for some reason, perhaps the light_source's
> 'projected_through' object feature might do the trick? There the object
> could be a say thin box of sized how ever you want relative to the wall
> and toward the object(1) from the wall. To this object you'd add the
> usual no_image, no_shadow, no_reflection qualifiers as needed.
>
> Bill P.
>
The object in a projected_through is NEVER visible. It never cast
shadow, is never seen in reflections nor refractions, and don't affect
radiosity. Ity's just a kind or portail through the light comes.
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