Bad displacement maps in 3.5

[Tristanartform]

I am having a terrible time generating a displacement map

I have attached screen shots to show what’s happening when I try. There’s one shot with the ZTool in it’s highest subdiv level so you can see how it should look.

The next shot is of the tool at it’s lowest subdiv level with a displacement map generated – see that it doesn’t fit properly.

There’s a shot of the map from ZBrush. It looks like the UVs have been wirdly rearranged and super imposed, which would explain why the map looks the way it does when projected on the tool. Again, I’m sure there’s a ZBR solution but I don’t know what.

I have also attached a screen shot of the tool in Maya so you can see the UV layout.

Here’s one more bit of info: When I export the tool as an obj from Zbrush in to Maya and open the UV editor I find all of the UV edges have been cut. The UV map is the same as in my enclosed screen shot, but all of the UV edges are separate. The first time this happened I laboriously sewed all of the edges without changing the layout, re-imported in to ZBrush and…no change.

I have also attached a shot of the mesh in Maya with a better UV layout. However, apparently the shape of the mesh had changed slightly from the mesh I used to fix these UVs. So, if I try to import this UV in to the tool in ZBrush the tool gets even more distorted. I’m sure there’s a work around for this (the point order is the same) but I don’t know ZBR enough to know how to do it.

Very frustrating.
Any one with any ideas?

Attachments

[dustinbrown]

Looks like your UVs are on multiple UV regions. Either use the UV tools in Maya to consolidate everything on to the 0-1 region, or use the multi-displace plug-in in ZBrush to generate your displacement maps.

If you change the point order of the mesh in Maya, even in the slightest, you won’t be able to import it back into your original ZTool in ZBrush. You’ll have to use Project All to get your detail back, or you’ll just have to start from scratch.

[Tristanartform]

Hi, and thanks for the reply.

The UVs are all in the 0-1 range. I’ve attached the Maya screenshot of the UVs (screenshot #3).

Originally when the the problem first appeared, I exported the tool in to Maya thinking that was it, and sure enough they were outside the 0-1 range. However, I corrected the UVs (screenshot #3) and reimported the OBJ with the new UV layout and it didn’t effect any change at all in the displacement glitch.

If this was the original cause, why has correcting the UV layout not fixed the problem? Perhaps I didn’t import the new OBJ correctly? Or perhaps it didn’t import in the UVs with the obj?

Not sure why ZBrush is not generating the map properly.

Any ideas are welcome. Help needed. Thanks.

[Tristanartform]

Still no luck. Anyone?