3D occluders - Githubissues

Zylann commented 7 years ago

I thought it would be interesting to have a way to cull 3D objects in addition to basic frustum culling. In busy scenes, it can happen that many things are in the frustum, slowing FPS down, but maybe only half can actually be seen, because they can be hidden by a wall, by a hill, litterally anything.

2.x had Rooms and Portals, but I feel like they are a bit too specific to interiors. If all you need is just a quad to occlude what's behind a wall or a hill, rooms aren't suited for that. Also rooms don't work in 3.0 (I tried to set an Area but it produced an error). I noted Unity also has this feature, which seems to do a great job, be it for interior or exterior scenes.

An alternative to manually place occluders in a scene is occlusion queries (which work for any kind of scene or procedural terrain), but I don't know if they are doable with the GLES3 renderer.

reduz commented 7 years ago

i have on my todo list a bunch of pretty cool culling techniques, but as always out of time for 3.0

On Sat, Jul 22, 2017 at 7:11 PM, Marc notifications@github.com wrote:

I thought it would be interesting to have a way to cull 3D objects in addition to basic frustrum culling. In busy scenes, it can happen that many things are in the frustrum, but maybe only half can actually be seen, because they can be hidden by a wall, by a hill, litterally anything. 2.x had Rooms and Portals, but I feel like they are a bit too specific to interiors. If all you need is just a quad to occlude what's behind a wall or a hill, rooms aren't suited for that. Also rooms don't work in 3.0. I noted Unity also has this feature, which seems to do a great job, be it for interior or exterior scenes.

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