Why is my high poly 3D model broken?

High poly 3D models break mainly from mesh errors, software memory limits, or incorrect export/import settings. Mesh errors (like non-manifold geometry or overlapping faces) confuse tools—unconnected edges or overlapping parts cause rendering/editing issues. Software glitches happen if your PC lacks enough RAM/VRAM to handle the high polygon count. Exporting without checking format compatibility (e.g., FBX vs. OBJ) or missing settings (like embedding textures) can corrupt files. Fix mesh issues with your software’s cleanup tool (e.g., Blender’s "Make Manifold"); for memory problems, decimate the model to reduce polygons. Always double-check export settings (like "Preserve Normals") before saving.