站长说的很对,补充一下: A#X.c=
Normal Vector 8>Z$/1Mh
The Normal Vector is a vector in 3D space that is used to orient the projection d~jtWd|?
plane for the irradiance map. The plane is defined to be perpendicular to the e@=[+iJc
Normal Vector, and the irradiance incident on the selected surface is projected Vb^s 'k
onto this plane. When the map is displayed, the normal vector is pointing toward J'yN' 0
you. ]7kGHIJ|
Up Vector $
bNe0
The Up Vector is a vector in 3D space that is used to orient the projection plane 1bg@[YN!;
for the irradiance map. The plane is defined so that the Up Vector is parallel to the tR*W-%
vertical side of the plane. The irradiance incident on the selected surface is NP`s[
projected onto this plane. When the map is displayed, the up vector will point `^L<db^A
toward the top of the screen.