To simplify an isometric 3D model, reduce its polygon count (via decimation), remove small non-essential details, and keep geometry aligned with isometric axes (30/60/90 degrees) to preserve its flat, angular style.
- **Decimate polygons**: Trim excess faces without losing the model’s key shape—start with a 10-20% reduction to avoid distortion. - **Cut small details**: Delete tiny edges, textures, or minor protrusions to lighten the file without harming its core design. - **Align with axes**: Keep geometry locked to isometric angles to ensure the simplified model stays true to its original perspective.
For beginners, use Blender’s "Decimate Modifier" or SketchUp’s "Simplify Contours"—adjust gradually to maintain structure.