Hi!

In the povray-code posted below, I'm trying to show two objects composed 
of transparent light emitting material, that intersect eachother, simply 
as an illustration of what the intersection should look like (first 
object red, second green, in the intersection both colors are emitted 
simultaneously).

This seems to work great, except when the surfaces of both objects come 
close to eachother.  Rendering the code should show some sort of cross 
composed of areas/pixels that are either fully red or green.  It is as 
if the rays only see the entrance into one of both objects, and the 
other object is disregarded.  Rendering with anti-aliasing partly hides 
the problems where they weren't too large in the first place, but the 
cross is still very visible.

Is there an easy solution for this?  (I suppose it's an accuracy 
problem, not a real bug)

Many thanks,
Stefaan


// Povray code for two intersecting, light emitting transparent lathes

camera {
	translate 1 * -z
	rotate <-90, 0, 0>
}

#declare cone0 =
	lathe {
		linear_spline
		2,
		<0, 0>, <.4, 4>
	}

#declare cone1 =
	object {
		cone0

		transform {
			translate -y * 2
			rotate <90, 0, 0>
		}
	}

#declare cone2 =
	object {
		cone0

		transform {
			translate -y * 2
			rotate <0, 0, 90>
			rotate <90, 0, 0>
		}
	}

object {
	cone1
	pigment { color rgbt <0, 0, 0, 1> }
	interior {
		media {
			emission rgb <.5, 0, 0>
			intervals 1
			samples 5
			method 3
			density { rgb 2 }
		}
	}
	hollow
}

object {
	cone2
	pigment { color rgbt <0, 0, 0, 1> }
	interior {
		media {
			emission rgb <0, .5, 0>
			intervals 1
			samples 5
			method 3
			density { rgb 2 }
		}
	}
	hollow
}

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