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Update GS rendering v2.0 #6357

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merged 6 commits into from May 15, 2024
Merged

Update GS rendering v2.0 #6357

merged 6 commits into from May 15, 2024
+259 −133

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slimbuck
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@slimbuck slimbuck commented May 13, 2024 •
edited

Having done more profiling, it seems that the order of splat data is by far the most important element when rendering large GS scenes on GPU.

Therefore this PR supersedes #6352: it takes the best parts, but without the additional memory requirements of the preprocess step.

Before:
Screenshot 2024-05-10 at 16 07 53

After:
Screenshot 2024-05-10 at 16 08 24

So, this PR:

  • Uploads splat order data to texture instead of uploading duplicate vertex data.
  • Renders splats by instancing a 128-quad mesh.
  • Refrains from rendering splats behind the camera.
  • Reorder uncompressed data at startup to match compressed format.
  • Default to half float for storing uncompressed data.

Issues:

  • reordering millions of splats at load time is not fast. For fast load time, use the compressed format. (We will investigate improving reorder performance in future)
  • we might want to expose a load-time option for users to disable splat reorder on load

Next steps:

  • Implement rendering directly from compressed format. This will cut runtime memory usage 4x.

@slimbuck slimbuck mentioned this pull request May 13, 2024
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@slimbuck @willeastcott
Update src/scene/gsplat/gsplat-instance.js
0359543 
Co-authored-by: Will Eastcott <willeastcott@gmail.com>
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vercel bot commented May 13, 2024 •
edited

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mvaligursky
mvaligursky reviewed May 15, 2024
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src/scene/gsplat/gsplat-instance.js
// number of quads to combine into a single instance. this is to increase occupancy
// in the vertex shader.
const splatInstanceSize = 128;
const numSplats = Math.ceil(splat.numSplats / splatInstanceSize) * splatInstanceSize;
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could use math.roundUp

@slimbuck slimbuck merged commit 614aedb into playcanvas:main May 15, 2024
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@slimbuck slimbuck deleted the gs-take-two branch May 15, 2024 09:51
@slimbuck slimbuck mentioned this pull request May 15, 2024
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slimbuck added a commit to slimbuck/engine that referenced this pull request May 20, 2024
@slimbuck
Update GS rendering v2.0 (playcanvas#6357)
374aa91
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@willeastcott willeastcott willeastcott approved these changes

@mvaligursky mvaligursky mvaligursky approved these changes

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