I want to use the "f_r" function to color a sphere from black (inner) to 
white (outer). However, there needs to be a hole in the center equal to 
1/7 of the sphere's radius, and the gradient must start at this location 
instead of the sphere's exact center.

Here is what I have:

pigment
{
	function {f_r(x,y,z) * 6/7 + 1/7}
	pigment_map
	{
		[0 color srgb 0]
		[1 color srgb 1]
	}
}

But the results are not correct.

How do I accomplish this? Thanks!


Mike

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