将SCNAction应用于SceneKit中具有约束的节点 [英] Apply SCNAction to a node with constraints in SceneKit

问题描述

我有一个具有约束的节点；更具体地说，它具有SCNLookAtConstraint：

I have a node that have a constraint; to be more specific, it has an SCNLookAtConstraint :

    let constraint = SCNLookAtConstraint(target: scene.retriveNodeFromScene(cameraNodeName))
    constraint.gimbalLockEnabled = false
    self.constraints = [constraint]

但是当我想要将节点移动到其他坐标，只是不移动。我没有收到任何错误，什么都没有发生。我进行了一些测试，如果删除约束，一切正常，节点移动没有问题。所以我该怎么做？对于我的问题，有什么解决方案吗？还是我应该寻找另一种方法，使其与我的约束等效，但又与SCNAction兼容？

But when I want to move node to other coordinates it just doesn't move. I don't receive any error, just nothing happens. I have made some tests, and if I remove constraint, everything is ok, node moves with no problem. So, what should I do? Is there any solution for my problem or should I find another way, equivalent with my constraint, but also compatible with SCNAction?

操作代码：

    let timeForAction = calculateTimerForSecoundAction()
    let action = SCNAction.moveTo(calculateEndingLocation(), duration: timeForAction)
    let delay = dispatch_time(DISPATCH_TIME_NOW, Int64(NSEC_PER_SEC * timeForAction))
    self.runAction(action)
    explodeAfterReachingFinalPosition(timeForAction)

推荐答案

与原始海报相同。
我用MNAUGES建议解决了这个问题。

Same issue as the original poster. I solved it with MNAUGES suggestion.

LookAt约束打破/防止了SCNAction在视图中发生。有趣的是，根据控制台，摄像头节点一直在移动，只是没有在视图中更新。我还可以通过将cameraNode.position = newPosition更改为视图来移动摄影机节点，但是没有很好的动画过渡。

The 'LookAt' constraint breaks/prevents the SCNActions from happening in the view. Interestingly, the camera node WAS moving - according to the console - just not updating in the view. I could also move the camera node in the view with a change to cameraNode.position = newPosition - but without the nice animated transition.

将cameraNode关联到emptyNode。将lookAt约束分配给cameraNode，并将moveTo SCNAction分配给emptyNode。

Parent your cameraNode to an emptyNode. Assign the lookAt constraint to the cameraNode and the moveTo SCNAction to the emptyNode.

这篇关于将SCNAction应用于SceneKit中具有约束的节点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！