@BB

I know the nodes are off, but what I learn (think to learn from this render)

The side walls, the middle ball, the roof and the floor all have the same material and node settings.

The side walls and the middle ball render perfect. (even with those materials and nodes)
But? ? The roof and the floor are to cry for.

It can be, and I do not know the internals for the calculations,but It could be that horizontal calculations are OK. But that vertical calculations have a problem. Or view angle?

Regarding  your comments, you are right on both.
*"You're using reflection as part of the diffuse color calculation. That's a nono."

*When only using this, (and omitting the Sphere map)  it gave a nice reflection of the figure on the side walls and the middle ball. Actually, the reflections are better then the figure itself.

*"You've got a Sphere_Map with solid white plugged into Reflection_Color. That's just going to give you a white glowing surface, except you also have Reflect_Lite_Mult turned on, which causes the Reflection_Color to be multiplied with the amount of light striking the surface there and added into the whole things. With a 50% light, that means glowing white 50%."

*Correct again. When removing the Reflect node from the diffuse color, and just using this White Sphere_Map into the Reflection_Color, I had a White glowing middle ball, with very soft color relections from the 4 color balls. And no artifacts on the middle ball.

All calculated "reflected" balls are at their correct position.
The middle ball reflects the figure and the balls, all at their correct position.
Problems are only on the roof, and the floor with a lot of horizontal and vertical color rupture lines.
in therorie thy should have the same quality as the side walls, but they do not.

Next try, I"ll tilt the roof, and see what happens.

I have a theorie:
When you see the scene in the preview mode:
the side walls are gray, and the roof and floor are black.
Tilt the roof, or the floor untill they turn gray in the preview window,  and they will render fine.
That is my theory. (Runnig a test render right now.)

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