On 1/17/2016 11:07 PM, Mike Horvath wrote:
> 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


I am now using a macro.

	#macro MakeChromadepthTexture(CameraLocation, CameraLookAt)
		pigment
		{
			spherical
			color_map
			{
				#for (i, 0, 240, 1)
					[i/240 color rgb CHSL2RGB(<240 - i, 1, 1/2>)]
				#end
			}
		}
	//	finish
	//	{
	//		ambient 1
	//		diffuse 0
	//	}
		scale vlength(CameraLocation - CameraLookAt) * 2
		translate CameraLocation
	#end

But my question is the same. How do I replace `spherical` with 
`atan(distance from camera)`? Possibly, the camera measurements will no 
longer be necessary.

Thanks.


Mike

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