To fix flickering in Cycles-rendered 3D models, focus on reducing noise, cleaning geometry, and adjusting material/lighting settings—these are the key solutions.
- **Increase samples**: Boost path tracing samples (especially for glossy/refractive materials) to cut random noise that causes flicker. - **Fix mesh issues**: Remove overlapping faces, non-manifold geometry, or broken UV maps—these confuse the renderer and disrupt surfaces. - **Tweak settings**: Dial back overly reflective materials, disable motion blur if needed, or use "Clamp Direct/Indirect" to limit extreme light values.
These steps target the root causes, ensuring smoother, more consistent Cycles renders.