Okay, this has been bugging me for a while. How do I get the ground color to match the background color when using a color other than white?   I set the background color and ground color to the same blue color. I set the specular and highlight colors and values to be the same. I set the ground to "Shadow_Catch_Only".   I then render the scene, but you can see an obvious "horizon line" where the ground plane ends. (See image) I tried unchecking the "Shadow_Catch_Only", but I get the same result. I tried using the FireFly Renderer and the P4 Renderer and get the same result.   When I set the background and ground to white (255,255,255), the "horizon line" disappears.   Anyone have any good ideas?

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