Unity Assets 3D models flicker mainly due to z-fighting (overlapping geometry), incorrect shader settings, low texture resolution, or misconfigured camera clipping planes.
Z-fighting happens when two surfaces are too close, forcing the engine to guess which to render first. Shader issues—like wrong transparency modes or lighting—can also cause flicker. Low-res textures lead to aliasing (flicker during movement), and tight camera clipping planes disrupt depth sorting.
To fix it: Check for overlapping meshes (use Unity’s "Show Bounds" tool), adjust shader settings (disable alpha clipping temporarily), or enable anti-aliasing/boost texture resolution. Small tweaks often resolve the issue.