BatchedMesh: `bufferSubData` causes lag

[marwie]

Description

Hi, I'm currently stress testing with 20 instances and ~300.000 vertices each. We have LODs generated and I reserve the vertex space of LOD 0 for each instance so the float32 buffer ends up being ~ 9.000.000

When LODs switch and setGeometry is called i noticed quite a few big lags which seem to be coming from the call to bufferSubData with the whole buffer.

My question is if this is currently expected or if I might be doing something wrong here.

Solution

I would hope this could be optimized by providing the ranges array and the batched mesh could keep track of which ranges have changed. Could this be a possible improvement?

Alternatives

Clamp the max size of a BatchedMesh (on my side)

Additional context

https://mastodon.gamedev.place/@marwi/112145459503913620