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Sparse Volumetric Light maps (WebGPU). Pretty happy with the current state. - Improved probe placement optimization, reducing light leaks - Worked on various smaller bugs light map stats: - VRAM Size: 20Mb - Probe samples: 16,384 - Probe count: 324,674 - Bake time: 267s - Bake hardware: RTX 4090

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Alex Goldring

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20,350 görüntüleme • 5 ay önce •via X (Twitter)

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Sparse Volumetric Light maps (WebGPU). Worked on ensuring C0 continuity across the entire map. For now this is achieved by purging incomplete node levels, works well enough even if it's a bit of a blunt tool. Actual locations for probes during the bake are now going through an optimization phase, which allows me to push probes behind surfaces out into the open resulting in much fewer light leakage artifacts. This video here has only 28,376 probes in the map, and takes 1.8Mb of VRAM
0:36

Sparse Volumetric Light maps (WebGPU). Worked on ensuring C0 continuity across the entire map. For now this is achieved by purging incomplete node levels, works well enough even if it's a bit of a blunt tool. Actual locations for probes during the bake are now going through an optimization phase, which allows me to push probes behind surfaces out into the open resulting in much fewer light leakage artifacts. This video here has only 28,376 probes in the map, and takes 1.8Mb of VRAM

Alex Goldring

15,814 görüntüleme • 5 ay önce

Working on Sparse Volumetric Light-maps. Thanks to CynicatPro🎃 for pointing me at Unreal's version. In a nutshell it's just another sparse voxel data structure. My implementation is, no doubt, different from Epic Games Store's own. I'm using 4x4x4 probe grid with intermediate nodes having very wide branching factor of 64 as well (4x4x4). I liked the parameters that Unreal is using, of limiting both total memory as well as the lowest level of detail, which is common in sparse grid implementations. Here's Bistro scene with just 1Mb limit. This is roughly equivalent to a 512x512 lightmap texture in 2d, except surface light maps require unique UVs and you typically get very little detail out of 512 resolution texture with a lot of light leaking. There is also no directional response. My implementation encodes second-order spherical harmonics for each probe (9 coefficients), encoding RGB channels as RGBE9995 (4 bytes). So far only worked on the structure, actual bake is yet to come. I've been eyeing sparse voxel structures for a while now, and have been studying them roughly since the GigaVoxel paper by Cyril Crassin but never really implemented anything for the GPU before. I was always the BVH-kind of guy. It's a fascinating topic. --- Stats for the scene: --- Total memory usage: 1.000 MB Node count: 609 Unique probe count: 24,025 Probe reuse: 38.36 % Unexpanded nodes: 15,714 --- Again, note that there is no GI going on here, only the structure of the probe tree and the algorithm for building it from a given scene.
0:46

Working on Sparse Volumetric Light-maps. Thanks to CynicatPro🎃 for pointing me at Unreal's version. In a nutshell it's just another sparse voxel data structure. My implementation is, no doubt, different from Epic Games Store's own. I'm using 4x4x4 probe grid with intermediate nodes having very wide branching factor of 64 as well (4x4x4). I liked the parameters that Unreal is using, of limiting both total memory as well as the lowest level of detail, which is common in sparse grid implementations. Here's Bistro scene with just 1Mb limit. This is roughly equivalent to a 512x512 lightmap texture in 2d, except surface light maps require unique UVs and you typically get very little detail out of 512 resolution texture with a lot of light leaking. There is also no directional response. My implementation encodes second-order spherical harmonics for each probe (9 coefficients), encoding RGB channels as RGBE9995 (4 bytes). So far only worked on the structure, actual bake is yet to come. I've been eyeing sparse voxel structures for a while now, and have been studying them roughly since the GigaVoxel paper by Cyril Crassin but never really implemented anything for the GPU before. I was always the BVH-kind of guy. It's a fascinating topic. --- Stats for the scene: --- Total memory usage: 1.000 MB Node count: 609 Unique probe count: 24,025 Probe reuse: 38.36 % Unexpanded nodes: 15,714 --- Again, note that there is no GI going on here, only the structure of the probe tree and the algorithm for building it from a given scene.

Alex Goldring

11,519 görüntüleme • 5 ay önce

Working on probe placement for Global Illumination (WebGPU) * Tetrahedral Probe Mesh * SH3 (L2) irradiance * octahedral radiance 64x64 (atlased) * 8830 probes placed by the algorithm (including outside)
1:07

Working on probe placement for Global Illumination (WebGPU) * Tetrahedral Probe Mesh * SH3 (L2) irradiance * octahedral radiance 64x64 (atlased) * 8830 probes placed by the algorithm (including outside)

Alex Goldring

11,814 görüntüleme • 5 ay önce

Working on sparse volumetric light maps for WebGPU. Got generation part sorted. The resolution is adaptive, refining near geometry and skipping through most of the empty space. The video is question uses a map that's only 10MB in size, including everything. That's less the amount of GPU memory that a single leaf takes up on one of threes in the scene, or texture on one of the sign-posts. We get about 1 sample every 30 centimeters in the world space. As a side note: gave my renderer quite the workout, rendering each probe as a separate non-instanced mesh for debugging.
1:11

Working on sparse volumetric light maps for WebGPU. Got generation part sorted. The resolution is adaptive, refining near geometry and skipping through most of the empty space. The video is question uses a map that's only 10MB in size, including everything. That's less the amount of GPU memory that a single leaf takes up on one of threes in the scene, or texture on one of the sign-posts. We get about 1 sample every 30 centimeters in the world space. As a side note: gave my renderer quite the workout, rendering each probe as a separate non-instanced mesh for debugging.

Alex Goldring

18,651 görüntüleme • 5 ay önce

My Source 2-like probe system + light baking for UE5 is pretty much done now fully. As seen in the video, with the right volume setup you can have super thin walls without light leaking. Plugin releasing in like a week, after my vacation. #UnrealEngine5 #UE5 #GameDev
1:09

My Source 2-like probe system + light baking for UE5 is pretty much done now fully. As seen in the video, with the right volume setup you can have super thin walls without light leaking. Plugin releasing in like a week, after my vacation. #UnrealEngine5 #UE5 #GameDev

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The secret to eevee is volume probe placement. #b3d #eevee
0:56

The secret to eevee is volume probe placement. #b3d #eevee

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Transient Absorption (TrA) Spectroscopy at the University of Auckland’s Photon Factory captures ultrafast molecular changes post-light excitation using femtosecond pump-probe lasers. 14 years old
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Transient Absorption (TrA) Spectroscopy at the University of Auckland’s Photon Factory captures ultrafast molecular changes post-light excitation using femtosecond pump-probe lasers. 14 years old

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1:37

SOMEONE’S NERVOUS: Eric Swalwell is on TV playing tough guy: "Nobody's flinching! We're shining a light on corruption!" Meanwhile, he's the one under DOJ probe for mortgage fraud, suing to block it, and crying "retribution" like Jack Smith. Bro, the only thing you're shining a light on is your own shady loans.

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Started using a low-res volumetric cloud map in Wicked Engine for secondary effects. It can be sampled easily by reflections (planar, probe, raytraced) and also helps with disocclusion noise:
0:39

Started using a low-res volumetric cloud map in Wicked Engine for secondary effects. It can be sampled easily by reflections (planar, probe, raytraced) and also helps with disocclusion noise:

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3:59

BREAKING ⚠️ Ahead of AI171 crash preliminary probe report release Friday, international aviation journal The Air Current reports the probe has narrowed its focus to movement of engine fuel control switches

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Btw, The UAE 🇦🇪 has a probe, Hope Probe, currently orbiting Mars and sending tons of valuable data back on Earth
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Btw, The UAE 🇦🇪 has a probe, Hope Probe, currently orbiting Mars and sending tons of valuable data back on Earth

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2:39

My #threejs Lumen Decor Studio is getting an update. It will now support more settings and more complex scenes, thanks to the latest library updates. I'm combining #WebGPU SSGI with light probes, giving us the best of both worlds. Real-time light bounces via SSGI, and when the camera stops moving, I bake probes to measure the average light in the room, generating fill lights that paint an envmap. I also created a denoiser for SSGI, avoiding the previous blur that discarded the AO. Now, everything is lighter, a little noisier, but it complements indirect light well. Live link coming soon. BTW: The video is on my YouTube Channel in case you want to watch it in a higher resolution: #creativecoding #archiviz #WebGPU

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4:16

Officials Vanish Amid Missing Funds Probe: A Senate grilling meant to shed light on a questionable Sh68 million expenditure in Samburu County took an unexpected twist. The very officials expected to provide answers seemingly vanished. #NTVTonight Number8, the poet Ibrahim Karanja.

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Miles Taylor speaks out for the first time about Trump probe. 😡

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Infinite light bouncing (almost) for free! #gamedev #webgpu

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Procedural, volumetric light shaft particles in Unity.

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0:39

Implemented Carmack-style light strings. A string of characters dictates the light intensity over time. Map 'a' to 0.0 and 'z' to 2.0. then Step through the string based on delta time.

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Ajit Pawar's son Parth Pawar not named in Pune land probe The land scam probe report indicts 3 officials Omkar Wable with more details #Maharashtra #Pune | Aishwarya Paliwal
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