I created the following pigment to be used with ChromaDepth glasses:

	pigment
	{
		gradient vnormalize(Camera_Location - Camera_LookAt) * -1
		color_map
		{
			[0/4 srgb <1,0,0,>]
			[1/4 srgb <1,1,0,>]
			[2/4 srgb <0,1,0,>]
			[3/4 srgb <0,1,1,>]
			[4/4 srgb <0,0,1,>]
		}
		scale vlength(Camera_Location - Camera_LookAt) * 100
		translate Camera_Location
	}

However, the relationship between distance and color is linear in my 
example. How do I change this so that the hue is based on atan(distance 
from camera)? Thanks!


Mike

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