// Auxiliary function to make String from depth map array func getStringFrom2DimArray(array: [[Float32]], height: Int, width: Int) -> String { var arrayStr: String = "" for y in 0...height - 1 { var lineStr = "" for x in 0...width - 1 { lineStr += String(array[y][x]) if x != width - 1 { lineStr += "," } } lineStr += "\n" arrayStr += lineStr } return arrayStr } let depthWidth2 = CVPixelBufferGetWidth(depthMap) let depthHeight2 = CVPixelBufferGetHeight(depthMap) CVPixelBufferLockBaseAddress(depthMap, CVPixelBufferLockFlags(rawValue: 0)) let floatBuffer = unsafeBitCast(CVPixelBufferGetBaseAddress(depthMap), to: UnsafeMutablePointer<Float32>.self) var depthArray = [[Float32]]() for y in 0...depthHeight2 - 1 { var distancesLine = [Float32]() for x in 0...depthWidth2 - 1 { let distanceAtXYPoint = floatBuffer[y * depthWidth2 + x] distancesLine.append(distanceAtXYPoint) print("Depth in (\(x), \(y)): \(distanceAtXYPoint)") } depthArray.append(distancesLine) } let textDepthUrl = documentsDirectory.appendingPathComponent("depth_text_\(dateString).txt") let depthString: String = getStringFrom2DimArray(array: depthArray, height: depthHeight2, width: depthWidth2) try depthString.write(to: textDepthUrl, atomically: false, encoding: .utf8)