Does anyone have a summary of the pattern requirements for
pigments? For example, the gradient pattern as a pigment needs at
least 2 colors as a color_map. 

I am also looking for pattern requirements for normal patterns.
For example, when using gradient as a normal pattern, you need to
specify an axis, and the amount of the normal, so the normal
would look like this: 
	normal {gradient x .764 
		color_map {...}
		}

Thanks.
Chuck

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