MicMac vs OpenReco

MicMac is free, open-source desktop software for reconstructing 3D models from imagery. Developed at IGN and ENSG within the LASTIG lab, it runs on Linux, macOS and Windows under the CECILL-B license. It supports frame cameras, pushbroom sensors and scanned analogue images, along with camera calibration models and dense image matching for deformation studies. Outputs can include point clouds, 3D models and ortho-imagery in a desired coordinate system. Intermediate results in open formats let users work at different stages, and quality indicators include bundle adjustment residuals, covariance matrices, parameter sensitivity and correlation images. The C3DC command computes a point cloud from oriented images; AperiCloud creates a sparse cloud with camera positions and orientations for viewing in MeshLab, but does not support 64-bit PLY. MicMac is adapted to big datasets and was initially built for experts and researchers, with use also described in architecture, archaeology and forestry. Documentation, tutorials, a wiki and user forum are available. Building from source involves multiple dependencies, and the Mac guide cautions that a current revision may not compile or may be unstable on a given OS.

OpenReco converts drone and camera imagery into dense point clouds, textured meshes, orthomosaics, and elevation models. Its node-based workspace can run a complete reconstruction graph or individual stages, while caching keeps results reproducible. Reconstruction uses COLMAP CUDA for GPU multi-view stereo and includes an automatic CPU fallback. Models can be georeferenced from EXIF GPS data or ground control points. Analysis tools measure volume, profile, area, and distance, and generate NDVI, ExG, and VARI vegetation maps. Listed exports include LAS, LAZ, PLY, OBJ, GeoTIFF, GeoJSON, DXF, CSV, 3D Tiles, and contour SHP. OpenReco is MIT licensed and open source. Desktop downloads are listed for Windows, macOS, and Linux. The site says no account or subscription is needed to download it, and the Free plan is free. Named target fields include surveying and mapping, agriculture and forestry, VFX and heritage, construction and earthworks, and robotics and research.