给个英文的.个人理解可能会有点出入.基本上是这个意思. *Swb40L^
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric b_\aSEaTT
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 4wBMBCJ;P
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 0gfa7+Y
are commonly used in the design of illumination systems, especially those used in " ,`fGu )
the far field. 4J-)+C/edx
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface s{`r$:!
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” {$O.@#'
the model and “go off to infinity.” Exiting rays are the collection of ray segments |2{y'?,
following the intersection point of a ray at a surface. Due to ray splitting, several M,q'
ray segments may contribute to the candela data for each incident ray. Incident c%Kv"Z%f
rays are the collection of ray segments which intersect the selected surface. No a|T P 2m
surface selection is required for Missed rays but one is necessary for Exiting and YG"P:d;s
Incident rays. eP[azC"G[
The candela plots represent flux versus angle and can be smoothed using the sT' wps 2
Candela Options dialog box. The iso-candela plots can be presented as false _%z)Y=Q
color maps or contour plots. The distribution plots are graphs of cross-sectional ?<xGO@b
.
curves through the candela distribution. 73 D|gF*
The orientation of the candela plots is determined by the Normal Vector and the v[35C] gS
Up Vector, as specified in the Analysis|Candela Options dialog box. The p24sWDf
normal vector specifies the axis of the candela plot and the up vector specifies 5NBc8h7 V
“which way is up.”
