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POPausing a SceneKit animation
 

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    <p>I'm trying to create a test app in which the user can pause an animation by clicking in the SceneView. The SceneView loads the animation from a .dae file created in a 3d app (Cinema 4D). The app successfully plays and loops the animation upon launch.</p> <p>To pause the animation, I used <a href="https://developer.apple.com/library/ios/#qa/qa2009/qa1673.html" rel="nofollow">Technical Q&amp;A QA1673</a> as a reference. In the case of this .dae file, the animation actually comes in as a hierarchy of animations, so I have tried reaching down to each underlying CAKeyframeAnimation and setting its speed to zero. My code currently looks like this:</p> <pre><code>- (void)mouseDown:(NSEvent *)event { SCNNode *cubeNode = [self.scene.rootNode childNodeWithName:@"C4D_Cube" recursively:YES]; CAAnimation *cubeAnimation = [cubeNode animationForKey:@"Cube_Anim_01-02-1"]; CAAnimationGroup *cubeAnimationGroup = (CAAnimationGroup *)cubeAnimation; // cubeAnimationGroup contains 3 CAAnimationGroups, each of which contains a CAKeyframeAnimation. // So I directly access each CAKeyframeAnimation and set its speed to zero. for (CAAnimationGroup *subGroup in [cubeAnimationGroup animations]) { CFTimeInterval pausedTime = CACurrentMediaTime(); [[subGroup animations] setValue:@0.0 forKey:@"speed"]; [[subGroup animations] setValue:[NSNumber numberWithFloat:pausedTime] forKey:@"timeOffset"]; } } </code></pre> <p>When I set a breakpoint, I can see that the speed of the keyframe animations does change from 1 to 0, but the animation continues to play at its normal speed in the scene view. I originally tried just setting the speed on the top level CAAnimationGroup to zero, but this also had no effect. What's the correct way to pause an animation in progress?</p>
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    1. USJack Bransfield
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