This usually means the "Normals" are flipped. In your 3D software, ensure your faces are pointing outward.
Blender is the most popular free tool for modders today. To convert OBJ to DFF, you will need a community-made plugin called or RW-Tools . The Steps:
Ensure your model is scaled correctly (GTA units are small). convert obj to dff
The RenderWare engine cannot read OBJ. DFF files contain the specific geometry, vertex colors, and material data required by the game engine.
In ZModeler, you must organize your parts into a hierarchy (e.g., placing wheels under the chassis dummy). This usually means the "Normals" are flipped
Use the Material Editor to ensure the shaders are set to "GTA" compatible types.
Comprehensive Guide: How to Convert OBJ to DFF for GTA Modding To convert OBJ to DFF, you will need
Check that your materials are named correctly to match your TXD file. Apply all transformations ( Ctrl + A > All Transforms).
Import your OBJ, fix the smoothing groups, and ensure the "Multi/Sub-Object" materials are correctly assigned.