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Last active February 7, 2026 21:57
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camera-conventions.md

Imagine you (taker) are standing behind camera, i.e., taking a photo using the camera, and a viewer is standing in front of camera.

OpenGL / Blender / NeRF / Nerfstudio

opengl
  • +X right
  • +Y up
  • +Z towards taker aka backwards, so "look-at" direction is -Z

OpenCV / standard CV convention / COLMAP

opencv
  • +X right
  • +Y down
  • +Z towards viewer aka forwards, so "look-at" direction is +Z

PyTorch3D

pytorch3d
  • +X left
  • +Y up
  • +Z towards viewer aka forwards, so "look-at" direction is +Z
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