Use this option only together with mc_panorama_view. This
option has been introduced to facilitate e.g. the calculation of
circum solar radiation. Three sub-options are available, sun,
mu, and zenith. When set sun, the camera is
aligned to sun (i.e. using the options sza and
phi0). and
as given by the option
mc_panorama_view now relates to the sun's position.
sets
cosine of the angular distance from the center of the sun.
-1
implies looking directly into the sun. With
we select the
direction around the sun on a circle with angular distance
from the center of the sun.
implies that the
camera pixel is looking in a direction exactly below the sun, at
the camera pixel will be looking exactly above the
sun. Increasing
means the direction of looking moves clock-wise
around the sun-camera-line (seen from the sun). If the sun is in the
zenith, the definition of
is identical to that in phi.
The sub-option mu aligns the camera geometry according to the options umu and phi. Be aware that phi0 and phi are defined differently!
The sub-option zenith makes only sense when using mc_spherical 3D. Then the camera is aligned to the zenith with respect to the lon-lat position of the camera.