Beginners can reduce a car’s 3D model by simplifying geometry, optimizing textures, and using basic decimation tools in easy-to-use software.
Remove small, non-essential details (like tiny trim or internal parts) that don’t change the car’s core shape. Resize textures to lower resolutions (e.g., 1024x1024 instead of 4096x4096) to cut file size. Use tools like Blender’s "Decimate" modifier (set to "Collapse") or SketchUp’s "Simplify Contours" to automatically reduce polygon count while keeping key features.
Duplicate your original model first to avoid losing work. Aim for 5k–10k polygons for web/AR (instead of 50k for high-end rendering). Test the reduced model in your target platform (like a game engine or 3D viewer) to check quality.