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

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