给个英文的.个人理解可能会有点出入.基本上是这个意思. 5 t ,X;
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 4MrUo9L$s
units, a luminous intensity plot is in units of candelas (lumens per steradian). In #.{ddY{
radiometric units, an intensity plot is in units of watts per steradian. Candela plots &!F"3bD0
are commonly used in the design of illumination systems, especially those used in @|:yK|6O
the far field. "&C>=
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface $It3}?>C'
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” H X{K5 +
the model and “go off to infinity.” Exiting rays are the collection of ray segments F~sUf qiJ'
following the intersection point of a ray at a surface. Due to ray splitting, several ? sv[vR(
ray segments may contribute to the candela data for each incident ray. Incident qVW3oj<2
rays are the collection of ray segments which intersect the selected surface. No ;}H*|"z;!
surface selection is required for Missed rays but one is necessary for Exiting and VG_xNM
Incident rays. jqlfypU
The candela plots represent flux versus angle and can be smoothed using the b}&.IJ&40j
Candela Options dialog box. The iso-candela plots can be presented as false Q`!^EyRA:^
color maps or contour plots. The distribution plots are graphs of cross-sectional ~ycWc Zi>
curves through the candela distribution. mu2|%$C;$
The orientation of the candela plots is determined by the Normal Vector and the @<3kj
R?j
Up Vector, as specified in the Analysis|Candela Options dialog box. The yqC158 P
normal vector specifies the axis of the candela plot and the up vector specifies lnGg1/
“which way is up.”
