What model are real-time people favoring for skydome radiance these days? Hosek-Wilkie? /cc @meshula
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I hear that :) Generally skies change kinda slowly. A strategy I used is to write the values into a 32x32 cubemap on the CPU in a low priority background thread and upload the cube to GPU whenever a new cube is ready. (16x16 visibly bands, 64x64 is only a bit nicer)
Yeah, this sounds about right. Definitely not trying to evaluate or multiply-sample the model every frame. Thanks for the pointers!
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Hmm… good points. I guess this can be combined with a simple disk for when the sun is visible (don’t want it pixellated :) Then it’s just a few hundred cube map samples per pixel. Still ouch, but much reduced.
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You really need the disc, most (all?) of the models generate the skyglow around the sun, but not the sun itself. Can you reduce the sampling load by convolving some of your calculations into a mip-chain? I don't really know what you're doing so I'm spitballing :)
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Realtime path tracing, so it’s a case of sampling a lot of rays per pixel, and each ray will also sample the sky multiple times to determine lighting. So Kind of unavoidable :)
End of conversation
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