从 didAdd 锚点获取 ARAnchor 的旋转
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【中文标题】从 didAdd 锚点获取 ARAnchor 的旋转【英文标题】:Getting rotation of ARAnchor from didAdd anchors 【发布时间】:2020-02-11 00:30:18 【问题描述】:所以我使用session(_ session: ARSession, didAdd anchors: [ARAnchor]
来获取所有检测到的平面(我不能使用renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor)
,因为我使用的是RealityKit 而不是ARKit)。
所以我的问题是,如何通过这种方法获得检测到的锚点的旋转?我想创建一个平面实体,它与检测到的锚点具有完全相同的位置、大小、方向和旋转。到目前为止,我使用大小的范围,位置的中心,但我不知道如何获得旋转。因为现在它检测到正确(正确的位置和大小)但与真实平面的旋转错误。
【问题讨论】:
@ARGeo 你知道答案吗? 【参考方案1】:您可以从 ARPlaneAnchor 的 transform 属性中获取位置和方向,然后使用它在 RealityKit 中渲染边界平面。
extension float4x4
/// Returns the translation components of the matrix
func toTranslation() -> SIMD3<Float>
return [self[3,0], self[3,1], self[3,2]]
/// Returns a quaternion representing the
/// rotation component of the matrix
func toQuaternion() -> simd_quatf
return simd_quatf(self)
func session(_ session: ARSession, didUpdate anchors: [ARAnchor])
guard let planeAnchor = anchors[0] as? ARPlaneAnchor else
return
// NOTE: When the ARPlaneAnchor is first created its transform
// contains the position and the plane.center == [0,0,0]. On updates
// the plane.center will change as the extents of the plane change.
let position = planeAnchor.transform.toTranslation()
let orientation = planeAnchor.transform.toQuaternion()
// The center is a position before the orientation is taken in to
// account, so we need to rotate it to get the true position before
// we add it to the anchors position
let rotatedCenter = orientation.act(planeAnchor.center)
// You have a ModelEntity that you created earlier
// e.g. modelEntity
// Assuming you added the entity to an anchor that is just
// fixed at 0,0,0 in the world, or you created a custom entity
// with HasAnchor set to 0,0,0
modelEntity.transform.translation = position + rotatedCenter
modelEntity.transform.rotation = orientation
// Doesn't seem to be a way to update meshes in RealityKit so
// just create a new plane mesh for the updated dimensions
modelEntity.model?.mesh = MeshResource.generatePlane(
width: planeAnchor.extent.x,
depth: planeAnchor.extent.z
)
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