Why is depth map 3D model so missing parts?

Depth map 3D models often have missing parts because reconstruction algorithms rely on complete, accurate depth data—if the depth map is incomplete or flawed, the software can’t create full surface geometry. Common causes include occlusions (objects blocking the sensor), shadows, or low-resolution scans, which leave gaps the algorithm can’t infer. For fixes: Use consumer devices (like phone LiDAR) to scan from more angles to cover hidden areas, or use basic hole-filling tools in software such as MeshLab for small gaps.