Black faces in Maya's high quality rendering in viewport

Isaiah Sherman

So I've seen this issue pop up every now and then but I've known a proper fix for it.

Sometimes when I turn on "High Quality Rendering," then press 7 for viewport lighting, some faces on my mesh turn black.

Does it have to do with UVs? I've had something show up fine until I'd applied a unique UV sheet to it and then it goes black everywhere I was creating new UVs.

When I press 6 to show unlit it is not black. So I'm thinking it has something to do with the lights in high quality and the UVs.

I'm using Maya 2k9, 1 spot light, and 2 point lights.

Progg

What video card are you using?

PredatorGSR

Could be some faces are reversed? Try turning on backface culling and see if they are. Could also try separating and combining the mesh and see if that fixes it.

Isaiah Sherman

Toggled BFC, they're not backwards.

This issue has happened across multiple cards, here at home and at school. My machine uses a GTX275, at school they use some old ATI card. Same issue.


In the past, exporting and reimporting the object has fixed the issue, but I want to know if there is a way to avoid that pointless step.

Progg

Most of the time this is a OpenGL issue with ATi but you are having the problems with an Nvidia card as well. I would say it is a Maya viewport glitch. High Quality rendering in Maya has always been really really sketchy. That's the one thing I wish I had more time to learn Max in better detail just to use the viewport in some cases.

Toast

Post a screenshot it could be normals.

Progg wrote: »

High Quality rendering in Maya has always been really really sketchy.

Autodesk agrees, that's why Viewport 2.0 is being developed...

CheeseOnToast

Sometimes just re-applying your shader to the mesh can fix this.

Isaiah Sherman

Now that you mentioned that, I tried something. I tried reapplying the same shader, didn't fix it.

I tried applying another shader, fixed it. Tried applying another shader (different than the first and second), and it happens again.

It can't be anything complex with my shaders, because I'm just using Blinns with DIFF and NORM maps.

However, applying different shaders on it does seem to have adverse effects.

moof

Yeah, have seen this. Can happen when you extract or combine meshes sometimes. Sometimes it just happens. I find you can fix it by just combining or removing races and recombining them.

/shrug

emlau8

It seem to this every time you do a negative scaling with Viewport 2.0.
I found that by freezing the transformations after negative scaling solve this problem!
Just be sure not to do your negative scaling on a group or you will have to unparent you mesh before freezing them to correct this problem.

Bartalon

Dat necro