CODEWITHSUNDEEP
iosscenekit
Curyous
Curyous

Reputation: 8866

How do you set up a game loop for SceneKit?

I'm trying to use SceneKit for the first time for a game and am wondering what you are supposed to do for a game loop for updating game state. I'm aware of

SCNSceneRendererDelegate.renderer:updateAtTime:

but this is not called if there are no changes to the scene and it does not need to be re-rendered. I also know that you can force rendering by using

SCNView.playing = true

but it seems wasteful to force a render when it's not necessary, as this is going to be frequent in my game. I could use an NSTimer, but then how do you synchronise it with render:updateAtTime:?

Upvotes: 1

Views: 939

Answers (1)

Hal Mueller
Hal Mueller

Reputation: 7646

The Apple documentation for SCNSceneRendererDelegate specifically calls out renderer:updateAtTime:, renderer:didApplyAnimationsAtTime:, and renderer:didSimulatePhysicsAtTime: as the places to add custom game loop logic.

Have you measured (with Instruments) a performance or energy difference when SCNView.playing is true? This sounds like a premature optimization.

Upvotes: 1

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