Document that exported poses are metric scale (closes #8) - #18
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Added clarification on metric scale of poses and comparison with SfM pipelines.
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Closes #8.
Someone building NeRFs asked whether Polycam's exported poses are metric scale, and the README didn't say either way. This adds a short note answering it directly, right after the existing ARKit coordinate-convention note.
Short answer: yes. ARKit's camera tracking fuses the device's IMU with visual data via visual-inertial odometry, and on LiDAR-equipped devices further grounds tracking with direct depth measurement -- both give the exported poses a real-world physical unit reference (translations in meters). That's different from vision-only SfM pipelines like COLMAP, where scale is ambiguous unless recovered from an external reference -- worth calling out explicitly since it's a genuine advantage of Polycam's raw export for metric-scale NeRF/3DGS training.
Docs-only change, no code touched.