给个英文的.个人理解可能会有点出入.基本上是这个意思. jW:7PS
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric `
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In 8&@=Anc&q
radiometric units, an intensity plot is in units of watts per steradian. Candela plots o-8{C0>:
are commonly used in the design of illumination systems, especially those used in 2|,$#V=
the far field. TZgtu+&
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ;dzy5o3
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” H(^Ehv>
the model and “go off to infinity.” Exiting rays are the collection of ray segments ko}& X=
following the intersection point of a ray at a surface. Due to ray splitting, several Z 8w\[AF{$
ray segments may contribute to the candela data for each incident ray. Incident L0![SE>
rays are the collection of ray segments which intersect the selected surface. No d*6f,z2=
surface selection is required for Missed rays but one is necessary for Exiting and )w].m
Incident rays. gT8(LDJ
The candela plots represent flux versus angle and can be smoothed using the Q6(~VvC-
Candela Options dialog box. The iso-candela plots can be presented as false WDw<kX 6p
color maps or contour plots. The distribution plots are graphs of cross-sectional FS"Ja`>j~
curves through the candela distribution. IOFXkpKR
The orientation of the candela plots is determined by the Normal Vector and the 08ZvRy(Je<
Up Vector, as specified in the Analysis|Candela Options dialog box. The t!\aDkxo %
normal vector specifies the axis of the candela plot and the up vector specifies #eJfwc1JY
“which way is up.”