首先,获取相机的旋转矩阵:
let rotate = simd_float4x4(SCNMatrix4MakeRotation(sceneView.session.currentFrame!.camera.eulerAngles.y, 0, 1, 0))
然后,组合矩阵:
let rotateTransform = simd_mul(r.worldTransform, rotate)
最后,对节点应用转换,转换为 SCNMatrix4:
node.transform = SCNMatrix4(rotateTransform)
希望有帮助
EDIT
这里如何从 simd_float4x4 创建 SCNMatrix4
let rotateTransform = simd_mul(r.worldTransform, rotate)
node.transform = SCNMatrix4(m11: rotateTransform.columns.0.x, m12: rotateTransform.columns.0.y, m13: rotateTransform.columns.0.z, m14: rotateTransform.columns.0.w, m21: rotateTransform.columns.1.x, m22: rotateTransform.columns.1.y, m23: rotateTransform.columns.1.z, m24: rotateTransform.columns.1.w, m31: rotateTransform.columns.2.x, m32: rotateTransform.columns.2.y, m33: rotateTransform.columns.2.z, m34: rotateTransform.columns.2.w, m41: rotateTransform.columns.3.x, m42: rotateTransform.columns.3.y, m43: rotateTransform.columns.3.z, m44: rotateTransform.columns.3.w)