Posted 16 May 2012 - 07:52 AM
Every time I render something I get those ugly artifacts that you can see on attached pictures. At first I thought that this is because of badly modeled geometry, but this is not the reason. This model on picture is made from one piece rotated around, so if it was broken, each piece should get the same artifacts.
They show quite randomly, but only on completely FLAT surfaces on geometry that have added "polygons as subdivision" attribute. I can take simple tube, scale one end, cap it, add bevel to maintain shape and flag it with "polygons as subdivision" and in the render I get completely clean render everywhere beside this caped, flat place.
What's the problem ?
If I add Subdivide node on the end, bump it sometimes even to 2, it helps, but then it makes no sense to use "polygons as subdivision". It happens in all modes in H12 and H11 - Micropoly, Raytracying, PBR. I don't get it only in MicroPoly mode in H10, but in PBR it shows.
BTW. Mantra is the only renderer out there that produces those artifacts with this geometry. MR, Modo, Vray - all renders clean geometry.
Posted 16 May 2012 - 08:47 AM
Posted 16 May 2012 - 08:50 AM
Desktop.rar 106.55K 25 downloads
Posted 16 May 2012 - 08:53 AM
Yeah, I know that it look like that, but if it was this, it should be visible on each piece always, not show up randomly.
Posted 16 May 2012 - 09:02 AM
Because you have so many n-gons, it just doesn't know what to do with them at rendertime.
Try and keep your meshes to quads. In the mean time, just turn subdivision off.
Posted 16 May 2012 - 09:14 AM
But even when I reduce geometry just to those couple polygons Mantra still doesn't know how to Subdivide them correctly ? That sucks. I was hoping that it can handle at least those couple ngons. Especially that those are completely flat surfaces, no bumps.
Anyway, thanks for looking at this.
Edited by mantragora, 16 May 2012 - 09:24 AM.
Posted 16 May 2012 - 09:45 AM
There was this entry in yesterday's Journal:
Houdini 12.0.626: Fixed a problem that would produce cracks when rendering subdivision surfaces with micropolygon rendering.
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