Geometry matters

[mmrender]

I’ve seen these months working with VRay that the geometry has a big influence in getting artefacts in render.
Last example was an interior where I had a cornice in the corner between roof and walls. Once I attached the cornice to the roof and weld the correspondent vertex, all my artefacts in that area disappeared.
I would like to ask you how would be the ideal way of dealing with coincident faces when modelling. For example, let’s say a wall, architray, door and glass panel. Do you model separated objects? If so, do you align the faces or put one “into” another? Or, do you model them as one continuous object?
I don’t know if it is a silly question that you had solved one million years ago…

Cheers,
Manuel

[joconnell]

Well I generally try to model things as continuous objects but for architectural stuff that doesnt really make sense from a speed point of view. There's a secondary ray bias controler in the bottom right of global switches that removes the coincedent faces errors when raised but it may cause renders to slow down slightly.

[mmrender]

Thanks j.
And do you use all the geometry closed? (i.e. glass as a box, etc)

[Dynedain]

I avoid coincident faces when modeling. If it is some kind of extrusions or trim on the wall, I'll frequently make it part of the wall object.