Question 1

How to speed up raycasting in three.js for complex models?

Accepted Answer

Use three-mesh-bvh to implement a Bounding Volume Hierarchy. It organizes geometry into a tree structure, drastically improving intersection test performance. Just integrate it with your three.js mesh using the provided extension functions for seamless use.

Question 2

three-mesh-bvh vs three.js built-in raycasting: which should I use?

Accepted Answer

three-mesh-bvh is better for scenes with high polygon counts or frequent spatial queries, as it optimizes performance through indexing. However, for simple meshes or one-off raycasts, the built-in three.js raycasting might be simpler and sufficient.

Question 3

How to generate BVH asynchronously with Web Workers in three-mesh-bvh?

Accepted Answer

Use the GenerateMeshBVHWorker class from the library. Note that WebWorker syntax support varies by bundler, so you may need to copy and modify code from the source folder if issues arise, as highlighted in the README.

Question 4

Can three-mesh-bvh handle skinned or animated meshes?

Accepted Answer

It has limited support via SkinnedMeshBVH, but the BVH is static and not ideal for real-time animations. You'll need to refit or regenerate the BVH when vertices change, which can impact performance for dynamic scenes.

Question 5

How to serialize and save BVH data with three-mesh-bvh?

Accepted Answer

Use MeshBVH.serialize to convert the BVH into a storable format, and MeshBVH.deserialize to load it back onto geometry. This is useful for precomputing BVHs in asset pipelines to reduce runtime costs.

Question 6

What are the performance trade-offs of using three-mesh-bvh?

Accepted Answer

While it accelerates raycasting, there's an initial cost for BVH construction, which can be mitigated with async generation. Additionally, the BVH adds memory overhead, and for simple scenes, the benefit may not outweigh the setup complexity.

three-mesh-bvh

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