I have three functions that return values between 0 and 1 (inclusive). 
What is the proper threshold to use with them? Here is an example of one 
such function.

isosurface
{
	function
	{
		convertLCH2RGBb2(y*100,sqrt(x*x+z*z)*100,atan2d(x,z))
	}
	contained_by
	{
		box {<-1,0,-1>,<+1,+1,+1>}
	}
	threshold	1
	accuracy	0.01
//	max_gradient	1.1
//	[evaluate P0, P1, P2]
//	open
//	[max_trace INTEGER] | [all_intersections]
	pigment {srgb 1}
}

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