给个英文的.个人理解可能会有点出入.基本上是这个意思. +I@2 ,T(eG
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric {KSy I#
units, a luminous intensity plot is in units of candelas (lumens per steradian). In hyY^$p+
radiometric units, an intensity plot is in units of watts per steradian. Candela plots SduU XHk
are commonly used in the design of illumination systems, especially those used in ypNe TR$4
the far field. A:\_ \B%<
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface [ $M l;K
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” @h\i <sh!^
the model and “go off to infinity.” Exiting rays are the collection of ray segments }tJMnq/m($
following the intersection point of a ray at a surface. Due to ray splitting, several \==M gy2J8
ray segments may contribute to the candela data for each incident ray. Incident p
~)\!
rays are the collection of ray segments which intersect the selected surface. No ` (]mUW
surface selection is required for Missed rays but one is necessary for Exiting and ]UrlFiR
Incident rays. knzQ)iv&&
The candela plots represent flux versus angle and can be smoothed using the u4xJ-Vu
Candela Options dialog box. The iso-candela plots can be presented as false t&-c?&FO\;
color maps or contour plots. The distribution plots are graphs of cross-sectional xR;z!Tg)
curves through the candela distribution.
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The orientation of the candela plots is determined by the Normal Vector and the +!t *LSF
Up Vector, as specified in the Analysis|Candela Options dialog box. The ltHuN;C\
normal vector specifies the axis of the candela plot and the up vector specifies 7'5/T]Z
“which way is up.”
