Crashy .blend: Nasty Multires + Subsurf combo #29366

New Issue

Pablo Vazquez · 2011-11-23T00:45:59+01:00

Pablo Vazquez commented

2011-11-23 00:45:59 +01:00

%%%Attached example .blend that crashes on render (internal), just open and F12.
.
I've tried to replicate in a fresh mesh, since this happened on an old .blend I started working on again, but couldn't redo, the only way was appending this faulty object to a new .blend, still crashes there.

I know editing a multires mesh + having subsurf is very nasty, but the result I was achieving was quite cool :) at least could not crash.

Tried in very latest trunk, and in official 2.60.

Simple backtrace from my non-debug build:
http://www.pasteall.org/26670
%%%

%%%Attached example .blend that crashes on render (internal), just open and F12. . I've tried to replicate in a fresh mesh, since this happened on an old .blend I started working on again, but couldn't redo, the only way was appending this faulty object to a new .blend, still crashes there. I know editing a multires mesh + having subsurf is very nasty, but the result I was achieving was quite cool :) at least could not crash. Tried in very latest trunk, and in official 2.60. Simple backtrace from my non-debug build: http://www.pasteall.org/26670 %%%

Pablo Vazquez commented

2011-11-23 00:45:59 +01:00

Changed status to: 'Open'

Pablo Vazquez commented

2011-11-23 01:04:02 +01:00

%%%Noticed that if you:

Apply the Multires Modifier, crashes.
Apply first Multires, then Subsurf, also crashes.
Apply first Subsurf modifier, then Multires, it doesn't crash.

:D%%%

%%%Noticed that if you: - Apply the Multires Modifier, crashes. - Apply first Multires, then Subsurf, also crashes. - Apply *first* Subsurf modifier, then Multires, it doesn't crash. :D%%%

Sergey Sharybin commented

2011-11-23 08:22:20 +01:00

%%%Developer's note:
It's something wrong with DerivedMesh for which tanget layer is adding: some vertices has got NaN coordinates. Not sure if it's multires itself which produces such coordinated (didn't see anything bad with coordinates/data in multiresModifier_disp_run), but NaN appears in ccgDM_copyFinalVertArray.%%%

%%%Developer's note: It's something wrong with DerivedMesh for which tanget layer is adding: some vertices has got NaN coordinates. Not sure if it's multires itself which produces such coordinated (didn't see anything bad with coordinates/data in multiresModifier_disp_run), but NaN appears in ccgDM_copyFinalVertArray.%%%

Sergey Sharybin commented

2011-11-23 08:23:31 +01:00

%%%Forgot to mention, there's fiew edges in that mesh which aren't connected to any faces. If this edges are deleted before rendering, there's no crash.%%%

Sergey Sharybin commented

2011-11-24 10:07:47 +01:00

%%%Made further investigation. NaN vertes appears in DerivedMesh after running ccgSubSurf_stitchFaces() from multiresModifier_disp_run(), so suppose problem is how this function works for meshes with edges not shared with any faces.
It's a bit tricky code to start tweaking without working on it before. Brecht, maybe it's simple for you now to fix this issue? Thanks.%%%

%%%Made further investigation. NaN vertes appears in DerivedMesh after running ccgSubSurf_stitchFaces() from multiresModifier_disp_run(), so suppose problem is how this function works for meshes with edges not shared with any faces. It's a bit tricky code to start tweaking without working on it before. Brecht, maybe it's simple for you now to fix this issue? Thanks.%%%

Brecht Van Lommel commented

2011-11-24 18:08:50 +01:00

%%%Fix in svn, thanks for the report.%%%

Brecht Van Lommel commented

2011-11-24 18:08:51 +01:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2011-11-24 18:08:51 +01:00

Pablo Vazquez commented

2011-11-24 22:14:47 +01:00

%%%great catch! thank you both for research and fix, cheers! :D%%%

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Crashy .blend: Nasty Multires + Subsurf combo #29366