If you're a 3D modeler working on assets for the Source engine, you may need to export your models from .obj format to .smd format. Here's a step-by-step guide on how to do it:

Step 1: Prepare your model

Before exporting, ensure that your model is properly UV-mapped and has all the necessary materials assigned to it. This will ensure that the model looks the way you intended when it's imported into the game engine.

Step 2: Convert materials to VTF

The Source engine uses VTF (Valve Texture Format) for its materials. You'll need to convert your model's materials to VTF format using the VTFEdit tool. Once the materials are converted, make sure to save them in the correct directory for the game engine to locate them.

Step 3: Use Crowbar tool

Crowbar is a useful tool for converting models to SMD format. Open the Crowbar tool and select 'File > Import > SMD' to import your .obj file. Crowbar will then convert the model to the .smd format, which is compatible with the Source engine.

Step 4: Set up collision models

If your model requires a collision mesh for in-game interactions, you can create and export a separate collision model in the same way as the main model. Just make sure to name it appropriately (e.g., modelname_collision.smd) so that the game engine recognizes it.

Step 5: Compile the models

Once your model and any necessary collision models are in SMD format, you can use a tool like GUIStudioMDL to compile them into a format that the Source engine can use. Make sure to set up the proper paths for the compiled models and materials in the game directory.

Step 6: Test in-game

After compiling and placing the files in the correct directories, you can launch your Source engine game and test your model in-game. If everything was done correctly, your model should appear as expected and be ready for use in your project.

By following these steps, you can successfully export your .obj model to .smd format for use in the Source engine. With your model ready for integration into your game, you can continue creating amazing content for players to enjoy.