SolidWorks is capable of opening OBJ files, allowing you to import 3D mesh data for various applications, primarily as graphics bodies. This enables you to view, reference, and potentially convert mesh models into editable solid or surface geometry within your SolidWorks environment.
Step-by-Step Guide to Opening an OBJ File
Opening an OBJ file in SolidWorks is a straightforward process. Follow these steps:
- Launch SolidWorks: Open your SolidWorks application.
- Access the Open Command:
- Click Open from the Standard toolbar.
- Alternatively, go to File > Open.
- Navigate to Your OBJ File: In the Open dialog box, browse to the location where your OBJ file is saved.
- Select File Type: This is a crucial step.
- In the "Files of type" dropdown menu (usually near the bottom of the dialog box), select Mesh Files (*.stl, *.obj;*). This filter will display all compatible mesh files, including your OBJ files.
- Open the File: Select your desired OBJ file from the list and click Open.
Your OBJ file will now load into SolidWorks as a mesh graphics body.
Understanding OBJ Files in SolidWorks
When you open an OBJ file in SolidWorks, it's important to understand what you're working with.
- What is an OBJ File?
An OBJ (Object) file is a standard 3D image format that represents 3D geometry using polygons (faces), vertices, and texture coordinates. It's a common output format for 3D scanners and 3D modeling software, often used for detailed visual models rather than precise engineering parts. You can learn more about the OBJ format on Wikipedia. - Mesh Body vs. Solid Body:
Unlike native SolidWorks parts (which are parametric solid or surface models), an OBJ file imports as a "graphics body" or "mesh body." This means it's a collection of triangular or quadrilateral facets that define the exterior shape, but it doesn't inherently contain the feature history or solid properties of a SolidWorks part.
Working with Imported Mesh Data
While a mesh body isn't a solid model, SolidWorks provides tools to work with it:
- Visualization and Referencing: You can view the mesh model, take measurements, and use it as a visual reference for designing new parts around it.
- Mesh Editing (Limited): SolidWorks offers some basic mesh editing capabilities under "Mesh Modeling" features, allowing you to repair, fill holes, or simplify the mesh in certain versions.
- Converting Mesh to Solid/Surface Model: For full CAD functionality (like applying features, modifying geometry with precise dimensions, or creating drawings), you typically need to convert the mesh body into a solid or surface model. This often involves:
- Using the ScanTo3D Add-in: If you have SolidWorks Premium, the ScanTo3D add-in is specifically designed to convert mesh data (from scanners or OBJ/STL files) into solid or surface models by automatically or manually fitting surfaces to the mesh facets.
- Manual Surface Creation: You can manually create SolidWorks surfaces or sketches that trace the contours of the mesh body and then use surfacing tools to build a new solid model from scratch.
Tips for Importing OBJ Files
To ensure a smooth import and efficient workflow, consider these tips:
- File Size: Large OBJ files with millions of polygons can significantly slow down SolidWorks. Consider simplifying the mesh in a dedicated mesh editor before importing if high detail isn't critical.
- Mesh Quality: Ensure the OBJ file has a "watertight" mesh (no holes or gaps) if you plan to convert it to a solid body, as this makes the conversion process much easier.
- SolidWorks Version: While core import functionality is consistent, advanced mesh tools like ScanTo3D are exclusive to SolidWorks Premium. Check your SolidWorks version for specific feature availability.
By following these steps and understanding the nature of OBJ files in SolidWorks, you can effectively integrate mesh models into your design projects.
