站长说的很对,补充一下: _Ds@lVY
Normal Vector l^
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The Normal Vector is a vector in 3D space that is used to orient the projection }I]W'<jY
plane for the irradiance map. The plane is defined to be perpendicular to the i+1Qf
Normal Vector, and the irradiance incident on the selected surface is projected -<PC"B
onto this plane. When the map is displayed, the normal vector is pointing toward "ee'2O
you. F;-90w
Up Vector w2C&%Xk
The Up Vector is a vector in 3D space that is used to orient the projection plane X>{p}vtvf>
for the irradiance map. The plane is defined so that the Up Vector is parallel to the :PUK6,"5]O
vertical side of the plane. The irradiance incident on the selected surface is O2% ` 2h
projected onto this plane. When the map is displayed, the up vector will point *%I[ ke *
toward the top of the screen.