SceneKit-绕X和Z轴旋转对象 [英] SceneKit - Rotate object around X and Z axis

问题描述

我正在将ARKit与SceneKit一起使用.当用户按下按钮时，我会创建一个锚点，并向与之对应的SCNNode添加一个3D对象(从项目中的.scn文件加载).

I’m using ARKit with SceneKit. When user presses a button I create an anchor and to the SCNNode corresponding to it I add a 3D object (loaded from a .scn file in the project).

3D对象面向相机放置，其方向与相机相同.我想使它看起来像是对象放置在平面上，而不是那样倾斜.因此，如果我做对了，则需要应用旋转变换，以使其绕X和Z轴的旋转变为0.

The 3D object is placed facing the camera, with the same orientation the camera has. I would like to make it look like the object is laying on a plane surface and not inclined if it is that way. So, if I got it right, I’d need to apply a rotation transformation so that it’s rotation around the X and Z axis become 0.

我对此的尝试是:取节点的x和z eulerAngles，将它们反转，然后围绕每个轴旋转该量

My attempt at this is: take the node’s x and z eulerAngles, invert them, and rotate that amount around each axis

let rotationZ = rotationMatrixAroundZ(radians: -node.eulerAngles.z)
let rotationX = rotationMatrixAroundX(radians: -node.eulerAngles.x) 

let rotationTransform = simd_mul(rotationTransformX, rotationTransformZ)
node.transform = SCNMatrix4(simd_mul(simd_float4x4(node.transform), rotationTransform))

这在大多数情况下都行得通，但是在某些情况下，对象是以完全奇怪的方式旋转的.我应该设置 除了当前欧拉角的倒数之外，还有其他旋转角度吗?直接将角度设置为0根本不起作用.

This works all right for most cases, but in some the object is rotated in completely strange ways. Should I be setting the rotation angle to anything else than just the inverse of the current Euler Angle? Setting the angles to 0 directly did not work at all.

推荐答案

我遇到了这个问题，发现我遇到了

I've come across this and figured out I was running into gimbal lock. The solution was to rotate the node around one axis, parent it to another SCNNode(), then rotate the parent around the other axis. Hope that helps.

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