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The abbreviations stand for:
x - left and right clip planes
y - top and bottom clip planes
z - near and far clip planes
e - margin between view and model box
v - rotation vector
r - rotation factor
m - rotation matrix
c - figure center
pd - perspective distance
pno - perspective near plane
pfo - perspective far planes
pf - perspective factor
pv - perspective view
NowUse - current use: 0=geometry, 1=mesh, post=2, graphs=3
DrawingType - render mode
LightVector - light direction in screen space