给个英文的.个人理解可能会有点出入.基本上是这个意思. 56 l@a {
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric {cpEaOyOM
units, a luminous intensity plot is in units of candelas (lumens per steradian). In <
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots GE|+fYVM-$
are commonly used in the design of illumination systems, especially those used in %gnM( pxl
the far field. 6h3HDFS7s
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface g'];Estb~
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 3]-_q"Co4f
the model and “go off to infinity.” Exiting rays are the collection of ray segments nUq <TJ
following the intersection point of a ray at a surface. Due to ray splitting, several @\&m+;6
ray segments may contribute to the candela data for each incident ray. Incident d--y
rays are the collection of ray segments which intersect the selected surface. No [sW.CK= 3
surface selection is required for Missed rays but one is necessary for Exiting and &[2U$ `P`V
Incident rays. |^28\sm2e
The candela plots represent flux versus angle and can be smoothed using the Bx [r C
Candela Options dialog box. The iso-candela plots can be presented as false ^I KO2Ft
color maps or contour plots. The distribution plots are graphs of cross-sectional b| SE<\
curves through the candela distribution. V|)>{Xdn
The orientation of the candela plots is determined by the Normal Vector and the :Q+5,v-c
Up Vector, as specified in the Analysis|Candela Options dialog box. The iut` 7
normal vector specifies the axis of the candela plot and the up vector specifies pj?XLiM54%
“which way is up.”
