Your 3D mesh has weird shapes mainly due to three common topology issues: non-manifold edges, flipped normals, or unconnected vertices.
- Non-manifold edges (shared by more than two faces) create jagged, impossible surfaces that break the mesh’s structure. - Flipped normals make faces face inward, leading to transparent or inverted-looking parts. - Unconnected vertices leave gaps or overlaps, distorting the model’s shape.
Fix these with your software’s mesh tools—like Blender’s "Select Non-Manifold" or Maya’s "Cleanup." Start with normals, then remove loose vertices/edges step by step.