#version 3.8;
global_settings {assumed_gamma 1.0 }

camera {
	location <0, 0, -10>
	right x*image_width/image_height
	up y
	look_at <0, 0, 0>
}

#declare E = 0.000001;

light_source {<0, 500, -1000> rgb 1}

sky_sphere {pigment {rgb 1}}

#declare Gradient = 
pigment {
	gradient x
	color_map {
		[0.00 rgbt 1]
		[0.00 rgb 0]
		[0.33 rgb x]
		[0.50 rgb x]
		[0.50 rgbt 1]
		[0.50 rgb y]
		[0.66 rgb y]
		[1.00 rgb z]
		[1.00 rgbt 1]
	}
}

#declare fG = function {pigment {Gradient}}

#declare Val = fG (val("-inf"), 0, 0);
#debug concat( "Val(val(\"-inf\")) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (-0, 0, 0);
#debug concat( "Val(-0) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (0, 0, 0);
#debug concat( "Val(0) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (+0, 0, 0);
#debug concat( "Val(+0) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (E, 0, 0);
#debug concat( "Val(E) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (0.5-E, 0, 0);
#debug concat( "Val(0.5-E) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (0.5, 0, 0);
#debug concat( "Val(0.5) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (0.5+E, 0, 0);
#debug concat( "Val(0.5+E) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (1-E, 0, 0);
#debug concat( "Val(1-E) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (-0+1, 0, 0);
#debug concat( "Val(-0+1) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (1, 0, 0);
#debug concat( "Val(1) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (+0+1, 0, 0);
#debug concat( "Val(+0+1) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (val("nan"), 0, 0);
#debug concat( "Val(val(\"nan\")) = ", vstr(5, Val, ", ", 0, 3), " \n")
#declare Val = fG (val("+inf"), 0, 0);
#debug concat( "Val(val(\"+inf\")) = ", vstr(5, Val, ", ", 0, 3), " \n")


box {<0, 0, 0> <10, 1, 0.001> pigment {Gradient scale <10, 1, 1>} translate -x*5}