9. Conventions

In raysect the following conventions apply:

• the coordinate system is right-handed

  • the x-axis (-ve, +ve) maps to (right, left)

  • the y-axis (-ve, +ve) maps to (down, up)

  • the z-axis (-ve, +ve) maps to (back, forward)

• object orientation in local space (for general consistency)

  • objects with a clear up and forward direction must be aligned such that their forward direction is along the +ve z-axis and their up direction is aligned to point along the +ve y direction

  • where objects have an obvious axis of rotational symmetry (e.g. a cylinder or cone) that axis should be aligned with the Z-axis

  • where objects have an obvious plane of symmetry, that plane should be aligned with the y-z plane

In raysect.optical:

• dimensions are in meters

• angles are in degrees

• solid angles are in steradians

• wavelength is in nanometers

• power is in Watts

• spectral radiance is in W/m^2/str/nm