How many frames does it take to make occlusion query result becomes available?

[leeziyu]

Hi there, I'm trying to build a rendering framework with occlusion culling. I'm expecting the occlusion query always lag one frame but it doesn't based on my tests. So my question is how many frames does it take to make occlusion query result becomes available? Thanks!

[bkaradzic]

In multi-threaded 2 bgfx::frame calls, in single-threaded 1 bgfx::frame call. You should always keep the same occlusion handle for the same mesh/object you're testing for visibility because after creation you'll have previous frame result that you could use. If object is invisible inflate bounding volume you're testing for visibility, if it's visible make tight volume.