8000 Single-pass IBL shadow voxelization for WebGPU by MiiBond · Pull Request #17270 · BabylonJS/Babylon.js · GitHub
[go: up one dir, main page]
Skip to content

Single-pass IBL shadow voxelization for WebGPU #17270

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom
Draft
wants to merge 5 commits into
base: master
Choose a base branch
from
Draft

Single-pass IBL shadow voxelization for WebGPU #17270

wants to merge 5 commits into from
+204 −79

Conversation

MiiBond
Copy link
Contributor
@MiiBond MiiBond commented Oct 10, 2025

This changes the voxelization strategy for WebGPU to allow it to be done in a single pass (though, generation of mips still takes additional steps). This is possible using textureStore to write to arbitrary texels in a 3D texture. It also uses vertex pulling to correctly determine the provoking vertex for each triangle and retrieve adjacent vertices so that we can calculate the triangle's normal. This is used to swizzle the xyz components to maximize the rasterized area and not miss voxels.

Anywho, this makes updating shadows for animated meshes much more plausible. I'm not sure the best way to do this but currently, in my playground, I'm doing this:

const frameSkip = 1;
let frame = 0;
scene.onAfterAnimationsObservable.add(() => {
    if (enableIblShadows) {
        if (frame == 0 && scene.animatables.find((anim) => !anim.paused)) {
            iblShadowsPipeline.updateVoxelization();
            iblShadowsPipeline.resetAccumulation();
        }
        if (frame === frameSkip) {
            frame = 0;
        } else {
            frame++;
        }
    }
});

Is there a better way to query whether there is currently an animation happening?

@bjsplat
Copy link
Collaborator
bjsplat commented Oct 10, 2025

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

@bjsplat
Copy link
Collaborator
bjsplat commented Oct 10, 2025

Snapshot stored with reference name:
refs/pull/17270/merge

Test environment:
https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17270/merge/index.html

To test a playground add it to the URL, for example:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17270/merge/index.html#WGZLGJ#4600

Links to test babylon tools with this snapshot:

https://playground.babylonjs.com/?snapshot=refs/pull/17270/merge
https://sandbox.babylonjs.com/?snapshot=refs/pull/17270/merge
https://gui.babylonjs.com/?snapshot=refs/pull/17270/merge
https://nme.babylonjs.com/?snapshot=refs/pull/17270/merge

To test the snapshot in the playground with a playground ID add it after the snapshot query string:

https://playground.babylonjs.com/?snapshot=refs/pull/17270/merge#BCU1XR#0

@bjsplat
Copy link
Collaborator
bjsplat commented Oct 10, 2025

Interaction tests

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17270/merge/testResults/interactionplaywright/index.html

@bjsplat
Copy link
Collaborator
bjsplat commented Oct 10, 2025

WebGL2 visualization test reporter:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17270/merge/testResults/webgl2playwright/index.html

@bjsplat
Copy link
Collaborator
bjsplat commented Oct 10, 2025

Devhost visualization test reporter:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17270/merge/testResults/devhostplaywright/index.html

@bjsplat
Copy link
Collaborator
bjsplat commented Oct 10, 2025

Visualization tests for WebGPU

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17270/merge/testResults/webgpuplaywright/index.html

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

No reviews

Assignees

No one assigned

Labels

None yet

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

2 participants

@MiiBond @bjsplat
0