ARKit 屏幕坐标到三维坐标到转换

思路：spa 1.取得屏幕坐标：orm CGPoint it 2.根据2D坐标取得3D模型：event ARHitTestResult form 3.经过SCNVector3Make将ARHitTestResult的worldTransform.columns[3].x，worldTransform.columns[3].y，worldTransform.columns[3].z作成SCNVect

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