站长说的很对,补充一下: 6J$I8b#/
Normal Vector #2Iw%H 2q&
The Normal Vector is a vector in 3D space that is used to orient the projection U5?QneK
plane for the irradiance map. The plane is defined to be perpendicular to the "zqa:D26
Normal Vector, and the irradiance incident on the selected surface is projected 3+iryW(\
onto this plane. When the map is displayed, the normal vector is pointing toward *Aug7
HlS
you. 2)QZYgfh
Up Vector yGX5\PSo
The Up Vector is a vector in 3D space that is used to orient the projection plane hb}Qt Q
for the irradiance map. The plane is defined so that the Up Vector is parallel to the G2P:|R
vertical side of the plane. The irradiance incident on the selected surface is NJQy*~P
projected onto this plane. When the map is displayed, the up vector will point (>lH=&%zj
toward the top of the screen.