给个英文的.个人理解可能会有点出入.基本上是这个意思. " ';K$&,[
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric b:t|9 FE%
units, a luminous intensity plot is in units of candelas (lumens per steradian). In qbD>)} :1
radiometric units, an intensity plot is in units of watts per steradian. Candela plots BH\!yxK
are commonly used in the design of illumination systems, especially those used in [H5BIM@{
the far field. YgL{*XYAt
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface o4F( X0
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” #Q'j^y 7=z
the model and “go off to infinity.” Exiting rays are the collection of ray segments !THa?U;
following the intersection point of a ray at a surface. Due to ray splitting, several 33z^Q`MTC
ray segments may contribute to the candela data for each incident ray. Incident !M@jW[s
rays are the collection of ray segments which intersect the selected surface. No $@^*lUw
surface selection is required for Missed rays but one is necessary for Exiting and g?E8zf `
Incident rays. 2D)B%nM[
The candela plots represent flux versus angle and can be smoothed using the @P @{%I
Candela Options dialog box. The iso-candela plots can be presented as false <@H`5[R
color maps or contour plots. The distribution plots are graphs of cross-sectional z,xGjS P
curves through the candela distribution. :` > bh
The orientation of the candela plots is determined by the Normal Vector and the @<`P-+m
Up Vector, as specified in the Analysis|Candela Options dialog box. The u1; sH{YK>
normal vector specifies the axis of the candela plot and the up vector specifies r@u8QhD
“which way is up.”
