给个英文的.个人理解可能会有点出入.基本上是这个意思. xe!bfzU
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric >WSh) (Cg
units, a luminous intensity plot is in units of candelas (lumens per steradian). In <YaT r9%w
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 9J3fiA_
are commonly used in the design of illumination systems, especially those used in >w
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the far field. W8d-4')|
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface eY<<Hld
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” (7Z+ De?
the model and “go off to infinity.” Exiting rays are the collection of ray segments dCd~]CI
following the intersection point of a ray at a surface. Due to ray splitting, several 4?R979
ray segments may contribute to the candela data for each incident ray. Incident _,J+b R+b
rays are the collection of ray segments which intersect the selected surface. No EF`}*7)
surface selection is required for Missed rays but one is necessary for Exiting and P.]h`4
Incident rays. ~>CvZ 7K
The candela plots represent flux versus angle and can be smoothed using the hne@I1
Candela Options dialog box. The iso-candela plots can be presented as false ;,f\Wf"BW
color maps or contour plots. The distribution plots are graphs of cross-sectional B>53+GyMV
curves through the candela distribution. X8 )k'h
The orientation of the candela plots is determined by the Normal Vector and the vX JPvh<
Up Vector, as specified in the Analysis|Candela Options dialog box. The ot}erC2~
normal vector specifies the axis of the candela plot and the up vector specifies ~:DL{Ze Eb
“which way is up.”
