给个英文的.个人理解可能会有点出入.基本上是这个意思. fUa g1 d
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric yt.c5> B^
units, a luminous intensity plot is in units of candelas (lumens per steradian). In >e5zrgV
radiometric units, an intensity plot is in units of watts per steradian. Candela plots U2*6}c<
are commonly used in the design of illumination systems, especially those used in jeN1eM8 WI
the far field. ioIv=qGdiP
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface @%i>XAe#0
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” %/0gWG
the model and “go off to infinity.” Exiting rays are the collection of ray segments j.-VJo)
following the intersection point of a ray at a surface. Due to ray splitting, several 6X+}>qy
ray segments may contribute to the candela data for each incident ray. Incident L9IGK<
rays are the collection of ray segments which intersect the selected surface. No 1q ~ LA[6
surface selection is required for Missed rays but one is necessary for Exiting and 1JTbCS
Incident rays. 4 9w=kzo
The candela plots represent flux versus angle and can be smoothed using the {ctwo X[;
Candela Options dialog box. The iso-candela plots can be presented as false si/er"&o
color maps or contour plots. The distribution plots are graphs of cross-sectional eFQ QW`J
curves through the candela distribution. #!!AbuhzK{
The orientation of the candela plots is determined by the Normal Vector and the ui.'^F<
Up Vector, as specified in the Analysis|Candela Options dialog box. The 5S/>l_od$2
normal vector specifies the axis of the candela plot and the up vector specifies i|2$8G3
“which way is up.”
