Open the point cloud in MeshLab (File > Import Mesh).
If you only see points, choose "Render > Point Set > Show Vertex Normals" in the MeshLab menu.
To convert points to a 3D model, choose "Filters > Remeshing, Simplification and Reconstruction > Poisson Surface Reconstruction" from the MeshLab menu.
Select the necessary parameters for Poisson Surface Reconstruction, such as "Depth" and "Solver Divide" to get the best result for your point cloud.
Wait for MeshLab to finish converting the point cloud into a 3D model.
Save the 3D model in the desired format (e.g., .obj) using "File > Export Mesh As" in the MeshLab menu.