You can use the cleaning and repairing function in Meshlab to complete the point cloud, and the operation steps are as follows: 1. Open the Meshlab, then click the "File" menu and choose to open the point cloud file to be completed. 2. Click the "Filter" menu and select "Clean and Repair"-> in the pop-up dialog box; "Remove the spacer", then check "Deselect the spacer" and click the "Apply" button. 3. Click the "Filter" menu again and select "Select"->; "Select the connected component." Then check "Connected Parts", it will extract a whole puzzle according to the connected parts, and then click the "Apply" button. 4. Click the "Filter" menu and select "Smoothing"->; "Ball Rotation", check "Re-grid Selected Blocks", and then click the "Apply" button. 5. At this point, you can see the finished point cloud. If you are not satisfied, you can repeat the above steps until you achieve the ideal completion effect.