To fix graininess in furniture 3D models, increase texture resolution and adjust rendering anti-aliasing or denoising settings—these two steps resolve most issues.
- **Boost texture quality**: Use 4K instead of 1K textures to eliminate pixelation from low-quality, stretched files—this is a top cause of grain. - **Adjust rendering**: Anti-aliasing smooths edge jaggedness; denoising reduces noise from low samples. For Blender, enable Cycles Denoising or raise sample counts; in SketchUp, use uncompressed textures and turn up Edge Anti-Aliasing.
By combining these steps, you’ll quickly get clean, professional-looking furniture models free of grain.