Source engine models often use custom normal data that can look "dark" or blocky in other software. You may need to clear "Custom Split Normals Data" in Blender's Object Data Properties to restore the "extra quality" smooth look. 3. Export to OBJ Once your model is cleaned up and looking right: Go to File > Export > Wavefront (.obj) .
: In Blender, go to Edit > Preferences > Add-ons and install the Blender Source Tools zip file. vvd to obj extra quality