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A comment on PowerVR Wizard GPU does real-time ray tracing at 10x lower power than Nvidia GTX. Parent comment

Re:PowerVR Wizard GPU does real-time ray tracing at 10x lowe... by Scaevolus on Thursday January 07, 2016 @05:15PM (#10861237)
I wonder if the Sorted Deferred Shading algorithm from Disney's Hyperion renderer could be adapted to realtime rendering? Optimizing a renderer that does one frame every 10 minutes to produce one every 16ms is difficult, but a scaled-down version with a lot of fakery might be possible.

http://www.disneyanimation.com/technology/innovations/hyperi...

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Re:PowerVR Wizard GPU does real-time ray tracing at 10x lowe... by berkut on Thursday January 07, 2016 @06:49PM (#10861765)
It won't - at least for general ray intersection itself, the deferred sorting doesn't buy you that much - the main benefit it gives you is much more coherent texture accesses, which Disney needs because they use PTex which needs coherent access for the filtering.

Almost everyone else is still doing pretty much shade-on-hit one-at-a-time and getting pretty good performance out of it.

PRMan RIS is batching shading points up, but after the first bounce the batches get much smaller, so the win you get from it is much less.

Disney do a lot of work sorting the batches, and that takes time.

Also their render times for full frames are generally 12 hours wall clock or more (like most of the rest of the VFX industry). And Disney are heavily de-noising their images afterwards anyway.

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Re:PowerVR Wizard GPU does real-time ray tracing at 10x lowe... by pasas on Thursday January 07, 2016 @05:18PM (#10861263)
where are you getting 10 minutes from?

most animation or vfx rendering takes hours per frame.

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Re:PowerVR Wizard GPU does real-time ray tracing at 10x lowe... by Scaevolus on Thursday January 07, 2016 @08:39PM (#10862312)
I probably misread the numbers in the paper.

The graphs in Figure 10 imply that the interior scene can be done in 10 minutes, but Figure 4 says the scene takes 68 minutes to render.

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