I distinctly remember looking at cityscape scenes in XSI a number of years ago when another user had similar problems.
If memory serves, the geometry is horribly corrupt and each material was duplicated per polygon or polygon cluster. There were winged edges with more than 3 polygons sharing the same edge, normals facing both ways on the same polygon, etc. Not at all surprised you're having problems. Although editing the geometry in XSI induced a lot of crashes, it was necessary to fix the problem. Also removing the userNormals property helped with shading issues. Finally, performing a delete unused materials combined with a simple script to merge/consolidate redundant materials cleaned up the rest. Since you're doing it all in Maya, I suspect you have the same problems. First check the geometry for user normals, or whatever Maya's equivalent is. If they exist, remove them. That should remove most of the problems. Then go into the geometry and unshare those winged edges and leave them as discrete polygons. That shouldn't have any negative affect on the rendered result. Finally, write a script to scan all the objects to see which shader nodes they're using and do a 'diff' between them as the shaders are likely duplicate copies. Once you find a duplicate, unshare it and replace it with the original copy. A lot of elbow grease, but should fix the problems in the end. Matt Date: Thu, 31 May 2018 21:14:26 +0000 From: “Ponthieux, Joseph G. (LARC-E1A)[LITES II]”<j.ponthi...@nasa.gov> Subject: A pain in the Arnold… To: “softimage@listproc.autodesk.com” Howdy yall, I thought I would post here before I escalate this but… Arnold on Maya 2018 is producing an error in render… I've got an ESRI City Engine scene imported into Maya 2018, It was working fine under Maya 2017 and rendering fine in Mental Ray. But mental Ray is gone now. It renders in the Maya Software render fine. In Arnold it produces what looks like triangulation (Tessellation) errors rendering some triangles darker than others. It only produces the problem on materials with texture maps. Disconnecting the textures from the diffuse color removes the problem. But removes the texture also. But this seems to indicate its not a lighting, normals, or shading error. I've turned literally everything in Arnold settings off or neutral and no change. Its not shadows, nor anti-aliasing, nor duplicate polygons, nor a bad mesh. Forcing a triangulate on the mesh can make different triangles darker but the problem does not go away. All reflections, shadows, motion blur, etc have been turned off in Maya and Arnold for Render Settings and Object. No change. Any thoughts? Thanks Joey ------ Softimage Mailing List. To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com with "unsubscribe" in the subject, and reply to confirm.
