Question 1

Is three-bvh-csg production-ready for CAD applications?

Accepted Answer

No, it's explicitly labeled as experimental with warnings about numerical precision and corner cases, making it unsuitable for production CAD where reliability and watertight results are critical. Consider more robust alternatives like Manifold CAD for such use cases.

Question 2

How does three-bvh-csg compare to other three.js CSG libraries like three-csg-js?

Accepted Answer

three-bvh-csg is significantly faster, claiming over 100x performance gains in complex scenarios, but it's experimental and requires two-manifold geometry. In contrast, libraries like three-csg-js are more stable but slower and based on older BSP algorithms.

Question 3

How to handle non-manifold geometry with three-bvh-csg?

Accepted Answer

You can't use it directly; the library requires all input brushes to be two-manifold. You must pre-process your geometry using tools to clean and make it watertight before applying CSG operations, which adds complexity.

Question 4

What are hollow operations in three-bvh-csg and when should I use them?

Accepted Answer

Hollow operations are experimental non-solid boolean effects that remove geometry from one brush without requiring it to be manifold. Use them for creating cavities or cutouts in meshes where standard solid operations might fail due to non-manifold inputs.

Question 5

How to export CSG results from three.js after using three-bvh-csg?

Accepted Answer

Due to draw range usage in the results, you must first convert the geometry to remove draw ranges before exporting with standard three.js exporters. This involves adjusting the geometry attributes, as mentioned in the Gotchas section.

Question 6

Can three-bvh-csg work with multi-material meshes effectively?

Accepted Answer

Yes, it supports multi-material handling with options like consolidateGroups and removeUnusedMaterials, but it requires geometry groups to be set up correctly and may have performance impacts in complex scenarios.

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