COLMAP vs Postshot

COLMAP is a free pipeline for reconstructing scenes in 3D from ordered or unordered image collections. Its Structure-from-Motion stage estimates camera poses and sparse 3D structure; its Multi-View Stereo stage uses PatchMatch stereo and stereo fusion to produce dense point clouds and meshes. Users can work through a graphical interface or command line. The GUI’s automatic reconstruction tool accepts an image folder and creates sparse and dense results in a workspace folder. For development, PyCOLMAP offers Python bindings for most functionality, and COLMAP can be built as a library for C++ code. Feature extraction options include SIFT, ALIKED, and LoMa; ALIKED and LoMa require ONNX support at build time. It supports a range of camera models and multi-camera rigs. Users can install pre-built binaries or build from source; macOS users also have a Homebrew formula, and a pre-built Docker image includes CUDA support. The library uses the new BSD license, while third-party dependencies have separate licenses. The project describes COLMAP as research software that may occasionally exit ungracefully when constraints are not met.

Postshot is a Windows application from Jawset for reconstructing photorealistic 3D scenes and objects from photos or video with radiance field technology. Its workflow covers tracking, training, editing, and rendering, with image masking, region-of-interest training, scene merging, and model sequence rendering. Inputs include JPG, PNG, TIF, EXR, DNG, and RAW images plus MOV, MP4, and MKV video. Exports are PLY, SPZ, and HTML, and integrations include Unreal Engine and After Effects. Free supports COLMAP and RealityScan camera and point imports. The Free plan allows unlimited image count, video length, and model size, with output up to 4K SDR (8-bit) for non-commercial use. Indie adds watermark-free renders, commercial use, floating licensing, and PLY/SPZ export. Studio adds further formats, above-4K and HDR output, command-line use, and AprilTag alignment. Free costs nothing; Indie and Studio are also listed at free.