给个英文的.个人理解可能会有点出入.基本上是这个意思. gz#2}
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric @.)WS\Cv#E
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ]w0_!Z&
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ?U+nR/H:6
are commonly used in the design of illumination systems, especially those used in (<2!^v0.M
the far field. &6e A.
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface yXQ 28A
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” `*WzHDv5p
the model and “go off to infinity.” Exiting rays are the collection of ray segments ]TVc 'G;
following the intersection point of a ray at a surface. Due to ray splitting, several i&KBMx
ray segments may contribute to the candela data for each incident ray. Incident <!=:{&d%
rays are the collection of ray segments which intersect the selected surface. No $MqEM~^=
surface selection is required for Missed rays but one is necessary for Exiting and os n ,kD*
Incident rays. wEZieHw
The candela plots represent flux versus angle and can be smoothed using the 0YZ66VN!
Candela Options dialog box. The iso-candela plots can be presented as false J@A^k1B
color maps or contour plots. The distribution plots are graphs of cross-sectional qnFg7X>C,
curves through the candela distribution. CHyT'RT
The orientation of the candela plots is determined by the Normal Vector and the 7jw5'`;)"
Up Vector, as specified in the Analysis|Candela Options dialog box. The @ 3rJ $6W
normal vector specifies the axis of the candela plot and the up vector specifies f}EsS
“which way is up.”