站长说的很对,补充一下: Ws?BAfP
Normal Vector }K,:aN,44\
The Normal Vector is a vector in 3D space that is used to orient the projection c;_GZ}8
plane for the irradiance map. The plane is defined to be perpendicular to the Tyu]14L
Normal Vector, and the irradiance incident on the selected surface is projected |+Z,
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onto this plane. When the map is displayed, the normal vector is pointing toward /0QGU4=
you. fq/F|c
Up Vector &fA`Od6l"
The Up Vector is a vector in 3D space that is used to orient the projection plane xN
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for the irradiance map. The plane is defined so that the Up Vector is parallel to the }$u]aX<
vertical side of the plane. The irradiance incident on the selected surface is -jsNAQ
projected onto this plane. When the map is displayed, the up vector will point L%`~`3%n-
toward the top of the screen.