[feynman]

Assigning realscale material changes object position (the coordinates, but not in space) and after 2-3 changes odd artifacts ensue that cannot be removed with recalc. of normals; I always have to fetch a new object in Rhino. Exporting the artifacted object to Rhino as OBJ renders it fine in Rhino. After just a few minutes with applying different materials, most objects get corrupted like the one shown here. Not good - often, I am almost finished to render a scene and I have to begin from scratch : (

http://i.imgur.com/8mhS9Ks.png

This is very strange. What can one do? Thanks in advance!

[Mihai]

This is kind of strange, but I think hitting recalc is not what you want to do and this is what is actually causing those artifacts which aren't really artifacts but it is due to Recalc discarding the vertex normals of the imported model and thus any sharp edges that looked good before will now have those smoothing issues. The only way to solve that in case you've hit Recalc would be to set the shading angle to 0, but then you would get facetting in places that should appear smooth. So vertex normals are needed and Recalc is not always useful.

But could you make a short screen recording to better see what's going on? And with that, upload a simple MXS that shows the problem.

[feynman]

Thanks for coming back on this.

The problem occurs while working with materials and shifting objects around in space; I only clicked recalc. normals much later in the process to see if that helps, which it did not.

I try to dropbox a scene and some OBJ files used to see if this problem can be replicated on other computers than the ones we have here, happens on all of them.

Another not so pressing isssue - the MXM preview (Weight map used, Normal map used, one layer only material) looks triangulated with some materials but not with others, any idea?

[seghier]

can you upload a simple scene to test it ?

[Mihai]

Another not so pressing isssue - the MXM preview (Weight map used, Normal map used, one layer only material) looks triangulated with some materials but not with others, any idea?
]

What you see is facetting on the object depending on how heavy/high frequency bump or normal map you are using. This was improved with V2 but the facetting cannot always be totally gone with certain maps and lighting situations. In these cases, don't necessarily go after the material preview object but your real scene. If you start seeing facetting with high frequency bump/normal maps, try lowering the bump intensity or if possible raise the polygon count of the object.