Convert OBJ to PTS

Understanding OBJ and PTS file formats

OBJ is a widely used 3D geometry definition file format developed by Wavefront Technologies. It stores 3D model data, including vertices, texture coordinates, normals, and faces, making it popular for 3D modeling and printing applications.

PTS is a point cloud file format commonly used to store large sets of 3D points, typically captured by 3D scanners. Each line in a PTS file represents a point in 3D space, often including color and intensity information.

Why convert OBJ to PTS?

Converting an OBJ file to PTS is useful when you need to extract only the point data from a 3D model for use in point cloud processing, analysis, or visualization software. This is common in fields like surveying, architecture, and reverse engineering.

How to convert OBJ to PTS

Since OBJ files contain mesh data (vertices and faces), converting to PTS involves extracting only the vertex (point) information. The process can be done using specialized software or scripts.

Recommended software for OBJ to PTS conversion

• CloudCompare: A free, open-source 3D point cloud processing software. It allows you to import OBJ files and export the vertices as a PTS file.
• MeshLab: Another free, open-source tool for processing 3D meshes and point clouds. You can import an OBJ file, then use File → Export Mesh As and select the PTS format.
• Custom scripts: For advanced users, Python scripts using libraries like numpy or Open3D can automate the extraction of vertex data from OBJ and write it to PTS format.

Step-by-step conversion using CloudCompare

1. Open CloudCompare and use File → Open to load your OBJ file.
2. Select the imported mesh in the DB Tree.
3. Use Edit → Mesh → Sample Points to extract vertices as a point cloud (if needed).
4. Select the point cloud and go to File → Save.
5. Choose PTS as the output format and save your file.

Tips for successful conversion

• OBJ files may contain more than just vertices; ensure you are exporting only the points you need.
• Check the PTS file for correct formatting: each line should represent a point, typically as X Y Z (and optionally color/intensity).
• If your OBJ contains color data, some tools can export this information to the PTS file as well.