Your flat-color 3D model appears sharp in high poly because the dense polygon count creates precise, smooth edges that avoid the jagged aliasing common in low-poly models—even with solid colors.
High-poly models use many small polygons to outline edges. When you apply flat colors (no shading or texture blending), these edges stay crisp instead of blurring—unlike low-poly models, which have fewer larger polygons that cause jagged lines.
If you want to reduce polygon count without losing sharpness, try two easy fixes: - Enable anti-aliasing in your render settings (it smooths jagged edges automatically). - Add tiny bevels to edges (they preserve crisp flat-color edges in lower-poly versions).