Nasty black flickering artifacts in Maya's HighQuality viewport rendering

[john-o]

I hope someone can offer some advice on this problem. I'm getting these nasty black flickering artifacts in Maya's HighQuality viewport rendering (which I need to display normalmaps) as you can see in attached jpg 1.

In jpeg 2, you can see that the artifacts are related to the triangles/topology of the mesh.
And in jpeg 3, you can see that they flicker across various different polys as the camera is rotated around.
Jpeg 4 shows default quality viewport rendering which has no artifacting issues .
(The problem also shows up in Hardware renders.)

Now this is my secondary computer that has the issue. It's a tablet pc, & as such it has a pretty mediocre videocard: mobile intel(R) 4 series express chipset family ( Mobile Intel® GS45 Express Chipset ). It seems odd though that the problem isn't that it can't render normalmaps, but rather seems to be stemming from rendering polys, which it renders fine in default mode. I have the latest drivers for it & have messed around with all the 3D settings it gives access to.
In Maya I've messed around with the high quality rendering settings, preferences--> display settings, & tried different kinds of lights (they all give the problem, including the default light).

Suggestions or work-arounds greatly appreciated. Thanks in advance.
-John

[chris-rogers]

try exporting as OBJ then importing. maya might have some corrupt data attached to some verts.
also try 'mesh->clean up geometry' to get rid of nonmanifold and zero area polys and stuff like that.  ive seen things like that related to cgfx shaders and .dll's being from different versions, too

good luck

chris

[andy-guttormsson]

Looks like it could be flipped face normals??? Go to Display (menu) > Polygons > Face Normals.  If the the little lines point inwards, and not outwards then the normal is flipped.  Select the face that is flipped, and in the Normals menu (Polygons Menu Set) select Reverse. 

[jeanmarc]

Is the model doubled on itself? (two of the same model in exactly the same place, I see this a LOT with on-line models that are downloaded -- if so, it's an easy fix in modelling).

[jericho740]

I had a similar problem at school.  Try these suggestions:

1.  Are you using displacement?  The flickering could be the result of going overboard with that.
2.  Did you assign multiple shaders to the geo?  That can mess up things pretty good.
3.  Try selecting the geo and go to edit -> Delete by type -> non-deformer history.
4.  check the geo for non-manifold geometry by going to mesh -> cleanup -> under "Remove geometry make sure that the "Nonmanifold geometry" box is checked off.
5.  Ummmm yeah... could be normals and could be some corrupt data.  Try selecting all your scenes assets (if they are grouped you can just select the top nodes) and export data into a new scene. 

oh and you may want to get rid of the triangles.

That's all I got for now... good luck dude!