From the docs: With regards to updating BufferGeometries, the most important thing to understand is that you cannot resize buffers (this is very costly, basically the equivalent to creating a new geometry). You can however update the content of buffers Let’s say I pre-allocate an array with size…

How costly is allocating new BufferAttribute array?

Mugen87 March 26, 2021, 5:14pm 5

If the size of the buffer changes then yes, you have to call dispose() on the geometry and create a new one.

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