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Technical ? about Iray, sub-D, and uvs

3WC

3WC

Engaged
Contributing Artist
I'm having an odd problem, illustrated by the screen caps below. Notice the gear in base resolution, textures look fine. However, when applying subdivision, textures start to look distorted. Renders in 3delight, however, look just fine, so I figured it was just a glitch with the subd preview.

Base.jpg

(Fig. 1 Base resolution)

BaseRender.jpg

(Fig. 2 Base render 3DL)

HiRes.jpg

(Fig. 3 Hi-res distortion)

Iray renders, however, retain the weirdness when rendering. It's not a good render, because I had 3delight materials still applied, but you can see the texture distortion.

HiResIrayRender.jpg

(Fig. 4 Iray render retains uv/texture distortion)

Anyone know what's causing this and how it can be fixed?

Thanks.
 
Pendraia

Pendraia

Sage
Contributing Artist
You need to have some edges close to where you want the sharp bits. Some programs have a function called crease...which will also help.
Edited because as I was rereading I saw you said it was okay in 3Delight renders. What are your mesh resolutions in set at?
 
3WC

3WC

Engaged
Contributing Artist
Seems there was a problem with the mesh, the subd was actually pulling it apart slightly. I may not have gotten some verts welded together in the modelling stage. I ended up just deleting this gear and copying and mirroring from the opposite side, as it didnt have the problem. Good advice too about keeping the hard edges, im not too concerned about that in this case.
 
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