站长说的很对,补充一下: fVbjU1N
Normal Vector Q{[@n
The Normal Vector is a vector in 3D space that is used to orient the projection b] 5weS-<
plane for the irradiance map. The plane is defined to be perpendicular to the daE.y_9y
Normal Vector, and the irradiance incident on the selected surface is projected 3s6obw$ki
onto this plane. When the map is displayed, the normal vector is pointing toward 7%*#M#(T
you. 9@ k8$@
Up Vector EA"hie7
The Up Vector is a vector in 3D space that is used to orient the projection plane yHeL&H
for the irradiance map. The plane is defined so that the Up Vector is parallel to the BEDkyz;:
vertical side of the plane. The irradiance incident on the selected surface is TnF~'RZYb
projected onto this plane. When the map is displayed, the up vector will point >8f~2dH2%
toward the top of the screen.