站长说的很对,补充一下: -DlKFN
Normal Vector gT<E4$I69
The Normal Vector is a vector in 3D space that is used to orient the projection xp7,0'(;
plane for the irradiance map. The plane is defined to be perpendicular to the aj20, w
Normal Vector, and the irradiance incident on the selected surface is projected A]Zp1XEG
onto this plane. When the map is displayed, the normal vector is pointing toward /R''R:j
you. m`g%\o^6i
Up Vector "monuErg&
The Up Vector is a vector in 3D space that is used to orient the projection plane +%>s\W+?]
for the irradiance map. The plane is defined so that the Up Vector is parallel to the si/F\NDT
vertical side of the plane. The irradiance incident on the selected surface is j$Vv'on
projected onto this plane. When the map is displayed, the up vector will point P~#!-9?
toward the top of the screen.