Many rays missing triangle edges

Ibraheem_A_ — Thu, 04 Sep 2014 04:36:14 GMT

Dear embree developer(s),

I am having problems with rays that exactly touch triangle edges (from what I can see). My task is to voxelize a mesh then from each voxel center shoot many rays towards the surface and capture the closest hit.

A hit by this definition should always happen but as you can see from this figure where I am visualizing only the misses with green lines:

Lots of misses are happening, looking closer we can see this is only an issue at the triangle edges:

I was looking more into the documentation and noticed a 'robust' option. So I tried it out and I got this:

Much better but still not perfect. So my question is: are there any other options I can try to hopefully guarantee accurate results? is there a more accurate fallback mechanism when a ray misses?

Thanks for making available this fantastic library!

The robust mode is the best

SvenW_Intel — Thu, 04 Sep 2014 05:16:55 GMT

The robust mode is the best accuracy you can currently get with Embree. I will look into your case of small cubes, maybe we find a fix to improve accuracy even more.

Thanks Sven. The latest

Ibraheem_A_ — Sat, 06 Sep 2014 19:36:20 GMT

Thanks Sven. The latest robust mode code solved all issues I had.

topic Thanks Sven. The latest in Intel® Embree Ray Tracing Kernels

Many rays missing triangle edges

The robust mode is the best

Thanks Sven. The latest