站長(zhǎng)說的很對(duì),補(bǔ)充一下: z |llf7:
Normal Vector 8)bR\s
The Normal Vector is a vector in 3D space that is used to orient the projection >)<?
plane for the irradiance map. The plane is defined to be perpendicular to the Ez~5ax7x
Normal Vector, and the irradiance incident on the selected surface is projected 2, )>F"R
onto this plane. When the map is displayed, the normal vector is pointing toward yn}Dj9(q
you. 4*qBu}(
Up Vector :pdX
The Up Vector is a vector in 3D space that is used to orient the projection plane Y[f]L4,V
for the irradiance map. The plane is defined so that the Up Vector is parallel to the Rm=p}
vertical side of the plane. The irradiance incident on the selected surface is JrOxnxd^
projected onto this plane. When the map is displayed, the up vector will point -B#1+rUW
toward the top of the screen.