站长说的很对,补充一下: 'LC-/_g
Normal Vector Hst]}g' .
The Normal Vector is a vector in 3D space that is used to orient the projection oJ4OVfknD
plane for the irradiance map. The plane is defined to be perpendicular to the Y8l
8B>
Normal Vector, and the irradiance incident on the selected surface is projected A?)nLp&Y
onto this plane. When the map is displayed, the normal vector is pointing toward qK=uSLo\+
you. |-+ IF,j
Up Vector kxvzAKz~
The Up Vector is a vector in 3D space that is used to orient the projection plane =o_Ua^mr
for the irradiance map. The plane is defined so that the Up Vector is parallel to the P6G&3yPt
vertical side of the plane. The irradiance incident on the selected surface is 41^ =z[k
projected onto this plane. When the map is displayed, the up vector will point z:gp\
toward the top of the screen.