CODEWITHSUNDEEP
iosobjective-cxcodeswiftscenekit
user1988379
user1988379

Reputation: 103

Real time continuous animation with SceneKit

I want to be able to apply animations in real time to an SCNNode. Basically, I have a node and I want to continuously input angles to it and have it animate in near real time. I've tried runActions: 

 var action1:SCNAction = SCNAction.rotateByX(CGFloat(45 / 180.0 * M_PI), y: 0.0, z: 0.0, duration: 0.5);

but the problem with actions is that if I have a stream of actions on the same node, it will only animate the latest action, you can't have it animate multiple actions. Then I ran across sequences, but sequences are a static array and so they cannot be populated dynamically in real time.

So my question is does anyone know of a way to animate an scnnode with streaming data. It doesn't have to be in real time, but that would be nice

Upvotes: 2

Views: 939

Answers (1)

IvanAtBest
IvanAtBest

Reputation: 2924

Have you tried simply setting the rotation? If you have enough data per frame it should be as smooth as it can be. That's what I use for VR.

Else, you can use the lerp() function, very popular with Unity to do this. I do not think this is built in Scenekit but we can use GLKVector4Lerp. Here's an Objective-C sample:

- (void)renderer:(id <SCNSceneRenderer>)aRenderer updateAtTime:(NSTimeInterval)time
{
    yourNode.rotation = GLKVector4Lerp(yourNode.rotation, newRotation, (float)time);      
}

That way you can continuously send data and the node will smoothly follow, without jumping.

Upvotes: 2

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