站长说的很对,补充一下: 6'|J
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Normal Vector ukvz#hdE
The Normal Vector is a vector in 3D space that is used to orient the projection .|x0du|
plane for the irradiance map. The plane is defined to be perpendicular to the 4hZ-^AL"(
Normal Vector, and the irradiance incident on the selected surface is projected yu3EPT!~
onto this plane. When the map is displayed, the normal vector is pointing toward ^J\)cw
you. p;X[_h
Up Vector +xFtGF)
The Up Vector is a vector in 3D space that is used to orient the projection plane -&@[]/
for the irradiance map. The plane is defined so that the Up Vector is parallel to the E8#y9q
vertical side of the plane. The irradiance incident on the selected surface is |LiFX5!\
projected onto this plane. When the map is displayed, the up vector will point 3l<)|!f]g
toward the top of the screen.