Second camera using culling mask = slow frame rate?

Unity Engine
1

ios performance is GOOD:
one camera
two objects

ios performance is BAD:
two cameras
two objects
(each camera is rendering one object by using culling masks)

Why? I’m stuck, Any help appreciated,

J

2

Ok so, for future people this is the problem.

More than one camera with any one of those cameras having a post effect = slow frame rate.

Would love to know why.

Thanks,

J

3

Profiler knows why.

Generally though, each camera does all culling again from scratch. This is why multiple cameras are a bad idea, especially if you have hundreds of objects, or thousands (even if not visible, they all need to be checked).

4

If it does, i wish it would tell me in a way i understand :slight_smile:

Only difference between 2 cams vs 1 cam is…

one extra draw call
one extra render render texture switch ← what does this do?

Does this reveal anything to you?

Thanks,

J

5

Wish I knew more about rendering.

Is there some reason why using a Render Texture and Graphics.Blit in the post effect script might effect performance is your using multiple cameras?