Wolfenstein 3D Director's Commentary with John Carmack

gold-coin · 1 month

The second part reminds me this song from GTA 1 soundtrack: http://youtu.be/NupUW9-l61s?t=7m31s

brandonpelfrey · 1 month

Your experience with SAH is indeed very different from mine. I tend to think that either something went wrong, or the distribution of primitives was close to uniform.

Regarding the stack pushing: you can keep the information of left child in local variables and only push the right child to stack. Instead of popping in each iteration you only pop from stack when you reach the leaf and then you overwrite the local variables with popped data. Something along these lines: http://pastebin.com/j2Qj309c (the code might be broken,i didn't actually tried it). I beleive you can modify your traversal routine in similar way.

brandonpelfrey · 1 month

Fair enough. Consider using SAH based splitting, that would bring nice performance boost to your ray intersections. Approximate SAH minimazation will do fine, without making your build signifcantly more complex. And btw, you dont have to push left child to the stack, since you are going to pop it out right in the next iteration anyway.

brandonpelfrey · 1 month

How does it compare to embree?

jezeq · 1 month

Presentations linked here are also worth checking.

corvuskorax · 5 months

I've implemented a neat algorithm which can speed up steps 3 & 4 (even if you don't have such clean line art), check it here.

riles2 · 7 months

This is pretty cool. Can you explain how do you stitch the gaps between different LOD levels?

jezeq

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