I have a storage buffer, and I use compute shader to create position of a number of mesh instances. The storage buffer has a fixed size to store positions of mesh instances. But the number of visible instances (<= fixed mesh instance size in storage buffer) are dynamically determined in the compute…

Here’s a proof of concept: Babylon.js Playground Babylon.js playground is a live editor for Babylon.js WebGL 3D scenes It will only work after this PR is merged: WebGPU: Allow to pass to a compute shader t…

Yes, this is theoretically possible, you have a read method on StorageBuffer. However, the read uses a promise, which means that you won’t get the result for the current frame but for the next one (or even later, depending on the time needed to read from the GPU). If this is not a problem in your d…

Hi @Evgeni_Popov Thanks for your suggestions! I actually have many more questions. I am not familiar with the low level WebGPU/WebGL API and how these functions relates to the GPU architecture and performance, and hence comes my questions and confusions. However, the read uses a promise, which me…

[image] slin: In BJS inspector, I do see the absolute FPS improves quite a lot with culling compare with drawing all N mesh instances I’m not sure I understand this point, the absolute FPS in the inspector is based on the javascript time of the frame, so the GPU time shouldn’t have any impact…

In Babylon, there is a mode in WebGPU called “non-compatible” mode (engine.compatibilityMode = false ) that uses a bundle for each call to draw a mesh. The special feature of this mode is that the number of instances (when a mesh is instantiated) is stored in a small GPU buffer, and is updated when…

@Evgeni_Popov It is still not working. Please see my last post above for what I tried in more details. How I tested: I removed the barrier() in compute shader and remove the code to reset storage buffer for mesh instance positions and orientations to 0. Now I can see meshes left over if previous …

Hi @Evgeni_Popov , I tested with the PR build version. It works! Thanks a lot for helping. Really appreciate your help to investigate into the problem and creating a PoC.

Dynamic size of instance count

Questions

arcman7 May 19, 2023, 9:23pm 13

If I were to follow these steps, could I test this out right now?

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Dynamic size of instance count

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