Isosurface with unstructured wedge grid render hangs

Open StasJ opened this issue 6 years ago • 1 comments

I have an unstructured grid with 5218112 wedge cells for which I am trying to render an isosurface (1spp, no ambient occlusion). 80% of renders take less than a second. 20% of the time ospRenderFrame will never return.

This problem does not appear to occur when rendering a volume of the same grid. It also does not appear to be a problem with hexahedral cells.

I also tried reversing the winding order to no avail.

Aug 02 '19 18:08 StasJ

Quick update: we can reproduce the hang (right now only when using the pathtracer, but should be the same root cause).

Sep 23 '20 06:09 johguenther

Several issues related to hangs with isosurfaces of Unstructured volumes are resolved now. We still witness extreme performance drops (10x to 100x) in some situations (e.g. camera is close to the isosurface, with shadows enabled).

Mar 09 '23 12:03 johguenther