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fSpy is a free, open-source camera matching application that calculates 3D camera parameters from still photographs. It helps artists align virtual cameras with the perspective of real-world images for accurate 3D modeling and compositing. Users define perspective reference lines to estimate camera orientation, position, and field of view. The application also provides controls for adjusting the principal point and reference measurements. Calculated camera parameters can be transferred to Blender using an official importer add-on. Other 3D applications can use the parameters through manual configuration or custom importers. Built with Electron and TypeScript, fSpy runs on Windows, macOS, and Linux.
Features
- Perspective-based 3D camera calibration from single reference photographs
- Interactive vanishing point alignment using adjustable perspective guide lines
- Camera field of view, orientation, and position estimation from image geometry
- Configurable principal point and reference measurements for accurate scene matching
- Official Blender importer for transferring camera parameters and reference images
- Cross-platform desktop operation with reusable project files and documented import formats
Project Samples
License
GNU General Public License version 3.0 (GPLv3)Follow fSpy
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