Am 21.11.2016 um 21:56 schrieb Mike Horvath:

>>> Actually, I can create a pigment already. But I don't know how to use
>>> the functions in a isosurface or a parametric to make the 3D object the
>>> pigment gets applied to, if possible.
>>>
>>> Mike
>>
>> Oops! You'll need to know these as well.
>>
>> #declare correctRGB1 = function(R,G,B) {min(max(R,0),1)}
>> #declare correctRGB2 = function(R,G,B) {min(max(G,0),1)}
>> #declare correctRGB3 = function(R,G,B) {min(max(B,0),1)}
>>
>>
> 
> That is wrong. The RGB values should *not* be corrected. In fact, if any
> of R, G or B are outside the range of 0 to 1, then the coordinate/color
> should be discarded. Sorry!

So if I understand you correctly, the shape you want is exactly the
volume for which R, G and B are all within the range from 0 to 1.

That sounds like a job for an isosurface to me.

Variant A: Create six isosurfaces, each representing one of the
boundaries (R<0, G<0, B<0, R>1, G>1, B>1), and intersect them.

Variant B: Refactor the functions from variant A, so that they have the
same threshold, combine them using max() or min() to achieve the
intersection effect, and turn that into a single isosurface.

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