Normal Device Coordinate with Different System

NDC [Normal Device Coordinate] 标准化设备坐标

• Clip coordinates - Wikipedia
• assume the coordinate system in math
  • x: outside the screen
  • y: right side
  • z: up side
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• NDC coordinate system

platform	coordinate system	rotation	cite
pytorch 3d	right hand	left hand, clockwise	pytorch3d doc
unity	left hand	left hand, clockwise	aclockworkberry
OpenGL	right hand		OpenGL doc

• 坐标系手性
  • 右手握住z，4指从x到y，拇指方向为正，则为右手坐标系
  • 反之为左手坐标系
  • 欧拉角，在对应的手性坐标系中，握住旋转轴，若与拇指同向，则转角为正，否则为负
• camera
  • pytorch
    • RT参数使物体旋转，相机不动

    • CONVENTIONS We adopt a right-hand coordinate system, meaning that rotation about an axis with a positive angle results in a counter clockwise rotation.

    • 旋转方向顺时针为正，拇指为轴方向，四指为旋转方向，left hand
  • unity
    • RT参数使相机变换，物体不动
    • 旋转方向顺时针为正，拇指为轴方向，四指为旋转方向，left hand
• 3dmax, unity, unreal
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• pytorch3d
  •