Looking for robust ray offsets

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graphicsMan
Posts: 154
Joined: Mon Nov 28, 2011 7:28 pm

Looking for robust ray offsets

Postby graphicsMan » Fri Jun 05, 2015 7:07 pm

Hi all -

It's been a while, but there was a paper or dissertation that discussed how to calculate robust ray offsets by pushing the low-order bits of the floats for the vector offset. I can't recall which paper or dissertation; can anyone please post a link?

graphicsMan
Posts: 154
Joined: Mon Nov 28, 2011 7:28 pm

Re: Looking for robust ray offsets

Postby graphicsMan » Fri Jun 05, 2015 8:11 pm

BTW, I was talking about Carsten Wächter's thesis: http://vts.uni-ulm.de/docs/2008/6265/vts_6265_8393.pdf

mattpharr
Posts: 9
Joined: Sat Jun 20, 2015 8:59 pm

Re: Looking for robust ray offsets

Postby mattpharr » Tue Jun 30, 2015 5:15 am

FWIW the third edition of Physically Based Rendering has a new section on numerical robustness issues for ray tracing. There are (we think) some new contributions in it, so we've posted a PDF of that chapter in the hopes that people will take a look at it and see if there are any issues before the book goes off to the publisher: http://pbrt.org/fp-error-section.pdf.

Happy to hear any comments that people have!

Matt


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