ZBrushCentral

3.5r2 : Backface Masking Not Working Well?

ZBrush Usage Questions
#1

I hope this is me just being stupid somewhere along the line. Sorry if the subject has already been well covered elsewhere.

Backface Masking in 3.5 does not appear to be working correctly. It works for *sculpting* as far as I can tell, but for the application of color ( masking and polypainting), I'm getting these odd patterned bleed-throughs on thin meshes. As you can see in the attached image, in 3.1 on the same obJ, it works perfectly. In 3.5 I still get significant bleedthough, much of it in a repeating pattern of polygons, like every third one is normal flipped or something. [attach=161832]BFMerrors.jpg[/attach] I thought maybe it might have something to do with geometry errors, as the first piece was generated entirely in ZB with topology and skinning and I had a lot of weird issues while trying to get the edges creased, but an imported OBJ I created externally suffered the same effect. The problem seems to affect any brush, and it is not merely a display issue, as you can see the checkered masking actually affects the geometry. Any thoughts are welcome. Hopefully I'm simply doing something wrong somewhere. I'm on Vista 64, and will furnish system info on request. Thanks!

Attachments

BFMerrors.jpg

#2

Hey Scott

I am trying to duplicate your issue. Could you put your tool up here so I can get it to try and duplicate the issue? Actually could you IM here at ZBC? Thank you.

Paul

#3

Hi! Sorry, I was away for the day. I presume you mean PM? If there is an IM address Im afraid I’m not aware of it. I Pm’d you a link to the complete files involved as well as advanced system info.

Attached to this post is a lower res (attachment limit…subD it 2 more times to match screenie) version of the OBJ I was using to test back and forth between 3.5 and 3.1 for anyone else who is feeling adventurous and would like to help me look like less of a crazy person. Make sure to use a brush large enough to penetrate to the other side.

Thank you for your time.

#4

I can confirm backface masking without zadd/zsub is leaving color artifacts on the backfaces.

-K

#5

Unfortunately, the Zadd aspect seems to make no difference for me…I get the issue regardless, if I use a brush with a large enough falloff. Interestingly, there is more bleed when masking, than when simply polypainting with the same brush.