给个英文的.个人理解可能会有点出入.基本上是这个意思. %`~+^{Wp
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ^j@+!A_.Q
units, a luminous intensity plot is in units of candelas (lumens per steradian). In $ @l=FV_;
radiometric units, an intensity plot is in units of watts per steradian. Candela plots . IM]B4 m
are commonly used in the design of illumination systems, especially those used in #U4
f9.FY*
the far field. M!i*DU+SE
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface m WHyk "l
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” = l:k($%%
the model and “go off to infinity.” Exiting rays are the collection of ray segments y} is=h3
following the intersection point of a ray at a surface. Due to ray splitting, several | UB)q5I
ray segments may contribute to the candela data for each incident ray. Incident &8yGV i
rays are the collection of ray segments which intersect the selected surface. No p]<)6sZ
surface selection is required for Missed rays but one is necessary for Exiting and `$XB_ o%@
Incident rays. 6=Wevb5YJ
The candela plots represent flux versus angle and can be smoothed using the O hRf&5u$
Candela Options dialog box. The iso-candela plots can be presented as false "ZPgl 8
color maps or contour plots. The distribution plots are graphs of cross-sectional !X||ds
curves through the candela distribution. 'nq~ 1 >i
The orientation of the candela plots is determined by the Normal Vector and the +o'xyR '(
Up Vector, as specified in the Analysis|Candela Options dialog box. The vz|(KN[
normal vector specifies the axis of the candela plot and the up vector specifies p1hF.
“which way is up.”
