给个英文的.个人理解可能会有点出入.基本上是这个意思. )0yY|E\
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 2oGl"3/p
units, a luminous intensity plot is in units of candelas (lumens per steradian). In -KCm#!
radiometric units, an intensity plot is in units of watts per steradian. Candela plots l { \~I
are commonly used in the design of illumination systems, especially those used in d Am( uJ
the far field. `.#e4 FBW
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ^z "90-V^
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” YB*ZY pRVl
the model and “go off to infinity.” Exiting rays are the collection of ray segments qyP@[8eH
following the intersection point of a ray at a surface. Due to ray splitting, several &
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ray segments may contribute to the candela data for each incident ray. Incident R1&(VK {
rays are the collection of ray segments which intersect the selected surface. No hGcOk[m 4
surface selection is required for Missed rays but one is necessary for Exiting and O)Nj'Hcu
Incident rays. Tm.(gK
The candela plots represent flux versus angle and can be smoothed using the w`CGDF\Oo
Candela Options dialog box. The iso-candela plots can be presented as false O<)"k j 7
color maps or contour plots. The distribution plots are graphs of cross-sectional BN |+2D+S
curves through the candela distribution. rgRh ySud
The orientation of the candela plots is determined by the Normal Vector and the 4 "@BbVYR
Up Vector, as specified in the Analysis|Candela Options dialog box. The NMJ2 3 0?
normal vector specifies the axis of the candela plot and the up vector specifies dSS_^E[{
“which way is up.”
