站长说的很对,补充一下: =LUDg7P
Normal Vector " %,KZI
The Normal Vector is a vector in 3D space that is used to orient the projection Mzbbr57n
plane for the irradiance map. The plane is defined to be perpendicular to the
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Normal Vector, and the irradiance incident on the selected surface is projected a9w1Z4
onto this plane. When the map is displayed, the normal vector is pointing toward u`Sg' ro
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Up Vector !Q0aKkMfL
The Up Vector is a vector in 3D space that is used to orient the projection plane ,^>WCG
for the irradiance map. The plane is defined so that the Up Vector is parallel to the 1Ar6hA
vertical side of the plane. The irradiance incident on the selected surface is ,)CRozC\}K
projected onto this plane. When the map is displayed, the up vector will point Hy_}e"
toward the top of the screen.