To simplify car 3D models fast, use automatic decimation tools in software like Blender or Meshmixer—these reduce polygon count quickly while preserving key details (e.g., body shape, panel lines).
Automatic decimation is faster than manual editing: it uses algorithms to remove non-essential vertices/faces. This works well for real-time applications (games, AR) or sharing smaller files without losing the car’s recognizable form.
For beginners, try Blender’s "Decimate Modifier" with the "Collapse" option—start with a 20-30% reduction and adjust to keep important details like grilles or door handles.