Very cool Garrett, transition looks on point. I find ortho projection for 3D map visualizations a bit jarring, but many professionals in carthography & construction seem to prefer it. Having a smooth transition between projections, helps a lot keeping track of what's going on.

Makes sense, didn't think about the need to adjust position so the frustum aligns. And, yes. I don't see any jitter at well. Well done!

very interesting looking effect indeed, are you animating the perspective FOV down to zero and transitioning to ortho? I thought about something similar, but I was worried it would cause visual artifacts, cause low FOVs tend to be a bit finnicky.

follow-up optimization xitter.cf/ScieCode/status/181108…

Found another potential optimization, breaking up instruction dependency, and allowing better pipeline while quarter-rate rcp runs. Got mixed results here, either no net gain or ~5% gain. Probably depends on the compiler, but should use this formulation eitherway.

It has been a net gain in most hardwares I've managed to get my hands on, but I only have access to a small set of gpus. Please let me know how your test goes.

Worth noting, snippet expects unit normals & returns uv in [-1,1] range (remap to [0,1] afterwards if the API expects that range)

I see Stubbe's octahedral decode opt in almost every usage I come across. But I've never seen it used for encoding. The same symmetry applies here! and its ~50% faster. Especially important for octahedral-encoded textures, as it's required for every sample! please RT.

Example of full padded octahedral-encoded mipchain. Pre-convolved with GGX roughness lobes.

Octahedral-encoded indirect specular map, with added border so it allows bilinear filtering, pre-convolved mips & trivially tiled within texture atlas. shadertoy.com/view/43G3Dd

different spectral band

plasma tornado. I love the sun.

I had bad experiences trying to explain things to web-standard people. 3 years ago - I've pointed this and other related issues to a similar group. They got caught up in the semantics of me saying "the correct way" instead of the actual problem. But perhaps I will try again.