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I had in this scene first several transparent objects, but I thought the strange results were due some of them penetrating, so I removed everything except the backdrop and one object.

Now it seems just changing the position of this object causes strange things to happen.

The bottle has a glass material applied (no complex ior used). The backdrop has a simple diffuse.

Here it is as it should look, position of the bottle:
0.006 | 0.005 | -0.017




Now the only thing I do is move the bottle one step in X:
0.005 | 0.005 | -0.017




Backdrop changes completely.......it is far off the ground, it doesn't touch anything. Also if I put a blend material on the bottle, backdrop looks like this:




So I think a lot of bad looking images we see coming from RC are due to materials.....

Ok it seems the IOR has something to do with it. If I set it to 1, the pic looks alright, but when I raise it above 1 things start looking weird.

Do you mean Nd?

Right, the Nd value. I'll send you the scene tom. You will see if you move the object from 0.005 in X to 0.006 all is well again.....

Mihai, .....you've been using that word ' penetrate ' a lot lately ......

....just an observation.

In that case, who's got the dirty mind, you or me?

LOL ..............

maybe numerical rounding problems in the core (i really hope not!).
Maybe try scaling the whole thing up by 100 or so and see if the same happens

arrrf si on commence a parler de SEXE !!!!

By the way RC comes back often what does that mean

rear what......