Hi Alain, not sure if I understood.

You're saying, that I could use a full-color image as heightfield? Like
the same file for texture and heightfield? But I am thinking, a texture
that shows green meadows and brown (soil) paths through them, would give
me the accurate heights. But maybe I am misunderstanding.

Or do you mean, instead of a gray-scale image, I should use a red-scale
image (or green-scale, or blue-scale)? Can you explain in easier words
for me, or give me a sample image? Thanks.

On 14.02.2016 10:57, Alain wrote:
> Performance tip:
> When evaluating a pigment, and that pigment in in shades of gray, it's
> better to use .red, .green or .blue instead of .gray.
> 
> This use the fact that all 3 channels always evaluate to the same value.
> .gray will evaluate each channels and perform a ponderated average that
> is always the same value as the red, green and blue channels.
> Using .red, .green or .blue, you only evaluate a single channel and
> don't need to do the averaging.
> 
> It ONLY work for gray levels pigments and images.
> 
> 
> Alain

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