ARKit -获取摄像机到锚点的距离
ARKit -获取摄像机到锚点的距离
提问于 2018-06-20 05:29:24
我正在创建一个锚，并将其添加到我的ARSKView中，在相机前的一定距离处，如下所示：
func displayToken(distance: Float) {
print("token dropped at: \(distance)")
guard let sceneView = self.view as? ARSKView else {
return
}
// Create anchor using the camera's current position
if let currentFrame = sceneView.session.currentFrame {
// Create a transform with a translation of x meters in front of the camera
var translation = matrix_identity_float4x4
translation.columns.3.z = -distance
let transform = simd_mul(currentFrame.camera.transform, translation)
// Add a new anchor to the session
let anchor = ARAnchor(transform: transform)
sceneView.session.add(anchor: anchor)
}
}然后为锚点创建节点，如下所示：
func view(_ view: ARSKView, nodeFor anchor: ARAnchor) -> SKNode? {
// Create and configure a node for the anchor added to the view's session.
if let image = tokenImage {
let texture = SKTexture(image: image)
let tokenImageNode = SKSpriteNode(texture: texture)
tokenImageNode.name = "token"
return tokenImageNode
} else {
return nil
}
}这工作得很好，我看到图像被添加到适当的距离。然而，我想要做的是计算当你移动时锚点/节点在相机前有多远。问题是，使用fabs(cameraZ - anchor.transform.columns.3.z)似乎可以立即停止计算。请参阅我的代码，该代码位于update()方法中，用于计算相机和对象之间的距离：
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
guard let sceneView = self.view as? ARSKView else {
return
}
if let currentFrame = sceneView.session.currentFrame {
let cameraZ = currentFrame.camera.transform.columns.3.z
for anchor in currentFrame.anchors {
if let spriteNode = sceneView.node(for: anchor), spriteNode.name == "token", intersects(spriteNode) {
// token is within the camera view
//print("token is within camera view from update method")
print("DISTANCE BETWEEN CAMERA AND TOKEN: \(fabs(cameraZ - anchor.transform.columns.3.z))")
print(cameraZ)
print(anchor.transform.columns.3.z)
}
}
}
}感谢任何帮助，以便准确地获得相机和锚之间的距离。
Stack Overflow用户
发布于 2018-06-20 13:14:33
这个是为scenekit准备的，不过我还是把它留在这里吧。
let end = node.presentation.worldPosition
let start = sceneView.pointOfView?.worldPosition
let dx = (end?.x)! - (start?.x)!
let dy = (end?.y)! - (start?.y)!
let dz = (end?.z)! - (start?.z)!
let distance = sqrt(pow(dx,2)+pow(dy,2)+pow(dz,2))页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50937214
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