GLTFLoader: Add EXT_mesh_gpu_instancing built-in plugin #24528
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Currenlty Three.js does not seem to support Points or Lines + Instancing so GLTFLoader GPU instancing extension handler ignores the extension if primitive draw mode is not triangle.
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Co-authored-by: Don McCurdy <[email protected]>
Co-authored-by: Don McCurdy <[email protected]>
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No change needed in this PR, but I have been wondering if we should eventually stop auto-flattening the node > mesh > primitive hierarchy, as we do now when there's only one primitive. It does make a number of cases more complex or confusing when the glTF mesh and primitives are sometimes a single THREE.Mesh, or sometimes a THREE.Group > THREE.Mesh[].
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Thanks for the suggestion. I think it's worth to consider to simplify the parser. But the matrices update of a scene is still one of the performance bottlenecks. So we may move the flatterning optimization to the end of the parse, or in the plugin using afterRoot hook. Anyways, I feel like opening another issue for it to dicsuss in the details.
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Or perhaps a SceneUtils function separate from GLTFLoader, but happy to discuss in another issue. 😇
Co-authored-by: Don McCurdy <[email protected]>
Co-authored-by: Don McCurdy <[email protected]>
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@takahirox just to clarify, instancing is now handled automatically with GLTFLoader and your external plugin is no longer needed? |
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@ashconnell Yes, you are right. |
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Again just clarifying, but does the GLTF file require pre-processing in order to take advantage of the instancing? I think I read that somewhere else but can't quite remember... |
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Yes, the glTF file must contain the |
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Gotcha. I'll look into that blender add-on. Is it worth adding a comment that says exactly what you just did in the example ? that's the first place I looked to try and understand how to use this. |
Related issue: #21937
From: #24518 (comment)
Description
This PR adds glTF
EXT_mesh_gpu_instancingsupport toGLTFLoader.I have already made
an external EXT_mesh_gpu_instancing plugin. As in #21937 Three.js devs seem to think it's good thatGLTFLoaderhas built-inEXT_mesh_gpu_instancingplugin. So I made this PR based on my plugin.Demo: https://raw.githack.com/takahirox/three.js/cf5bf1de939d9df3bb26f4923208b17a1723125c/examples/webgl_loader_gltf_instancing.html
Additional context
@Mugen87 I use assets from @shantzis1962 in the example. Please add @shantzis1962 to the change log if this PR lands.