mergeObjects drawcall

[kkl]

Hi Egon,

Does mergeObjects() reduce drawcalls? If 10 objects are merged into one, is there going to be one drawcall or 10 drawcalls?

[EgonOlsen]

Depends on what you merge. If you merge objects that all use the same textures, then the answer is yes. If the textures differ, you'll have at least as many draw calls as you have different textures.

[kkl]

Got it. Reconfirm: Does it mean if there are >10 objects, but only with 2 textures, it should have 2 drawcalls?

[EgonOlsen]

It might depend on some other variables too, but basically yes.

[kkl]

What are the other variables? It would be great if I know all of them to optimize performance. It's even better if I can get the number of drawcalls per frame, but I know it's kinda hard, isn't it?

[EgonOlsen]

It also depends on blending modes when using multi texturing, shaders (if used) and additional vertex attributes (if assigned).