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Le 18-04-06 à 14:16, Mike Horvath a écrit :
> On 4/6/2018 1:59 PM, Mike Horvath wrote:
>> On 4/6/2018 1:20 PM, Mike Horvath wrote:
>>> I'm trying to capture a shadow of an object that I will later process
>>> in GIMP. I want the shadow to be perfectly black, and the rest of the
>>> image to be perfectly white. (A bit of anti-aliasing is fine.)
>>>
>>> How can I accomplish this? I have a white plane, but it ends up
>>> slightly darker than white. Also, the shadow is a bit lighter than
>>> black.
>>>
>>> Thanks!
>>>
>>>
>>> Mike
>>
>>
>> Disregard.
>>
>> I set the background to 0 and the white plane's diffuse to 2, and I am
>> getting desired results now.
>>
>>
>> Mike
>
> I discovered a problem with increasing diffuse past 1.
>
> At high diffuse values (for instance `diffuse 200`), the border of the
> shadow is no longer "fuzzy" with some gray pixels as a result of
> anti-aliasing. Instead, the border is extremely sharp, with black
> bordering directly on white.
>
> So I changed the diffuse of the white plane from `2` to `1/sind(60)`,
> where `60` is the angle of the light source above the plane.
>
> Not sure if this is the correct workaround, mathematically.
>
>
> Mike
It' beter to use that texture:
texture{
pigment{rgb 1}
finish{ambient 0 diffuse 1 brilliance 0}
}
brilliance 0 make the illumination direction independent.
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