站长说的很对,补充一下: A?!I/|E^;
Normal Vector t G.(flW,
The Normal Vector is a vector in 3D space that is used to orient the projection &-yGVx
plane for the irradiance map. The plane is defined to be perpendicular to the V3N0Og3
Normal Vector, and the irradiance incident on the selected surface is projected `iKj
onto this plane. When the map is displayed, the normal vector is pointing toward <lxD}DH=
you. .lG5=Th!
Up Vector FyL_xu\e
The Up Vector is a vector in 3D space that is used to orient the projection plane yqOuX>m 1c
for the irradiance map. The plane is defined so that the Up Vector is parallel to the j=+"Qz/hr_
vertical side of the plane. The irradiance incident on the selected surface is mg:!4O$K
projected onto this plane. When the map is displayed, the up vector will point Tpp &
toward the top of the screen.