"gulino" <nomail@nomail> wrote:

> but I have a error in
> Grass (x, y,z)*GrassHeight}
>
> "Expected '.', * found instead"

Yeah - inbuilt pigment functions return a full rgbft vector, so you have to
specify which vector component you want to use in the crippled user-defined
scalar function you're writing.

So, just do:
Grass (x, y,z).red*GrassHeight

- BW

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