Rendermesh edges revealed when using Dirt Texture as Bump

[monksalve]

I'm trying to use the Dirt Texture to mimic irregularities in a gloss plastic part (sink marks, slight ridges at edges). It works well except it renders the rendermesh, see attached sample. Any idea what might be causing this? The geometry is imported as STEP. Native geometry doesn't seem to have this issue but have not quite proved that completely (would need to remodel the whole thing, want to avoid that).

Here is a non comprehensive list of what I've tried:

- Turned every knob, button and slider on the dirt texture options
- Increased resolution of rendermesh. Edges still showing.
- Tried variations of global illumination vs direct illumination
- Used different Anti-Aliasing Filters
- Used Progressive vs Adaptive Rendering
- Scaled object smaller and larger
- Imported object as a native Solidworks File instead of a STEP file
- Exploded and re-knitted object

All this to no noticeable improvement. In fact, I think it's gotten worse.

Any help welcome. Thanks!

[Peter.Chaushev]

Hello,

Could you please pack the scene (V-Ray > Pack Project) and email the produced archive file at support@chaosgroup.com for further investigation?
Be sure to mention the full version numbers of Rhino and V-Ray for Rhino you are using.

Kind regards,
Peter

[Peter.Chaushev]

Posting here the same reply I left in https://forums.chaosgroup.com/forum/...re-as-bump-map

Slotting a Dirt texture in Bump slot/mtl will actually always produce this effect. These are both raytraced texture (calculated on render time). Regard the resulting "seams" as a known limitation.
My advise is to use a different texture for the Bump Mode/Map slot and have the Dirt texture slotted in Bump Amount instead. This will allow the Dirt to control the bump effect distribution. Resulting effect should be pretty much the same (minus the "seams").