我有一个扩展名为 .scn 的 3D 模型。如何在没有来自 iOS 示例放置对象应用程序的虚拟对象文件的情况下使用捏合手势缩放它。
如果从 .obj 文件转换为 .scn，则捏合手势可以很好地工作。但它不适用于 .dae 模型。
func addPinchGestureToSceneView() {
pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(scale))
pinchGesture.scale = 1.0;
pinchGesture.delegate = self
self.sceneView.addGestureRecognizer(pinchGesture)
}
private func node(at position: CGPoint) -> SCNNode? {
var hitTestOptions = [SCNHitTestOption: Any]()
hitTestOptions[SCNHitTestOption.boundingBoxOnly] = true
return sceneView.hitTest(position, options: hitTestOptions)
.first(where: { self.getOnlyModelName(name: $0.node.name ?? "") == self.currentmodel.modelname})?
.node
}
@objc func scale(_ gesture: UIPinchGestureRecognizer) {
if self.currentmodel.isZoomEnabled == false{
return
}
let location = gesture.location(in: sceneView)
guard let node = node(at: location)else{return}
// guard let node = node(at: location) else { return }
switch gesture.state {
case .began:
originalScale = node.scale
gesture.scale = CGFloat(node.scale.x)
print("Begin:: \(originalScale)")
case .changed:
guard var originalScale = originalScale else { return }
if gesture.scale > 2.0{
return
}
originalScale.x = Float(gesture.scale)
originalScale.y = Float(gesture.scale)
originalScale.z = Float(gesture.scale)
node.scale = originalScale
case .ended:
guard var originalScale = originalScale else { return }
if gesture.scale > 2.0{
return
}
originalScale.x = Float(gesture.scale)
originalScale.y = Float(gesture.scale)
originalScale.z = Float(gesture.scale)
node.scale = originalScale
gesture.scale = CGFloat(node.scale.x)
default:
gesture.scale = 1.0
originalScale = nil
}