站长说的很对,补充一下: xlQBe-Wg
Normal Vector hCC<?5q
The Normal Vector is a vector in 3D space that is used to orient the projection )wT-8o
plane for the irradiance map. The plane is defined to be perpendicular to the +E{|63~q
Normal Vector, and the irradiance incident on the selected surface is projected yu;P +G
onto this plane. When the map is displayed, the normal vector is pointing toward Hy^N!rBxfO
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Up Vector ZIQ
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The Up Vector is a vector in 3D space that is used to orient the projection plane #{?qNl8F*J
for the irradiance map. The plane is defined so that the Up Vector is parallel to the
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vertical side of the plane. The irradiance incident on the selected surface is ]*AR,0N&
projected onto this plane. When the map is displayed, the up vector will point ?#fu.YE\
toward the top of the screen.