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

问题描述

我将 ARKit 与 SceneKit 结合使用.当用户按下按钮时，我会创建一个锚点，并在对应的 SCNNode 中添加一个 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，与相机的方向相同.我想让它看起来像物体放在一个平面上，如果是这样的话，它不会倾斜.所以，如果我做对了，我需要应用一个旋转变换，使其绕 X 轴和 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，反转它们，并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可以正常工作，但在某些情况下，对象以完全奇怪的方式旋转.我应该设置旋转角度除了当前欧拉角的倒数之外的其他任何东西?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

我遇到了这个问题并发现我遇到了 万向节锁.解决方案是围绕一个轴旋转节点，将其作为另一个 SCNNode() 的父节点，然后围绕另一个轴旋转父节点.希望有所帮助.

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.

这篇关于SceneKit - 围绕 X 轴和 Z 轴旋转对象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！