站长说的很对,补充一下: E,ZB;
Normal Vector ZF/J/;uI
The Normal Vector is a vector in 3D space that is used to orient the projection A
.jp<>
plane for the irradiance map. The plane is defined to be perpendicular to the WacU@L $A
Normal Vector, and the irradiance incident on the selected surface is projected IgHs&=
onto this plane. When the map is displayed, the normal vector is pointing toward e GqvnNv
you. #(26t _a
Up Vector )\I? EU8
The Up Vector is a vector in 3D space that is used to orient the projection plane @gu77^='
for the irradiance map. The plane is defined so that the Up Vector is parallel to the 0T{c:m~QXe
vertical side of the plane. The irradiance incident on the selected surface is N,sqr k]
projected onto this plane. When the map is displayed, the up vector will point &"r==A?
toward the top of the screen.