The refit's pipelines and their bind-group layout, compiled once and shared by any number of GpuBvhRefits on the same device.
Readonly
The pipelines; throws before prepare has finished.
prepare
Compiles the kernels (asynchronously, so the main thread doesn't stall); later calls share the first.
The refit's pipelines and their bind-group layout, compiled once and shared by any number of GpuBvhRefits on the same device.