Your 3D eye model deforms in Mixamo mainly due to incompatible topology, incorrect rigging weights, or misaligned bone influences.
- **Topology issues**: Mixamo’s auto-rig needs clean, even topology—messy edges, n-gons, or too many faces prevent proper animation distribution. - **Weight painting errors**: If eye vertices are tied to head/cheek bones instead of eye bones, deformation occurs. - **Misaligned bones**: Bones not matching Mixamo’s standard rig can’t control the eyes correctly.
Fix it by simplifying topology (use quads, cut excess edges), using Mixamo’s "Adjust Rig" tool to realign eye bones, or double-checking weight maps for custom rigs (ensure only eye bones affect eyes).