[Mihai]

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.....

[Mihai]

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.

[tom]

Do you mean Nd?

[Mihai]

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.....

[ivox3]

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

....just an observation.

[Mihai]

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

[ivox3]

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

[faraz]

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

[cyberjuls]

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

By the way RC comes back often what does that mean

rear what......