给个英文的.个人理解可能会有点出入.基本上是这个意思. ;}/@ar7s3
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric +=Xgi$
units, a luminous intensity plot is in units of candelas (lumens per steradian). In WcE{1&PXx
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ctqXzM `
are commonly used in the design of illumination systems, especially those used in ~QVN^8WPg
the far field. (+_i^SqK
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface "otks\I<
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” "'M>%m u
the model and “go off to infinity.” Exiting rays are the collection of ray segments ze5Hg'f
following the intersection point of a ray at a surface. Due to ray splitting, several Y bX3_N&
ray segments may contribute to the candela data for each incident ray. Incident 7soiy
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rays are the collection of ray segments which intersect the selected surface. No Hjho !np
surface selection is required for Missed rays but one is necessary for Exiting and `/+%mKlC|[
Incident rays. SiBhf3
The candela plots represent flux versus angle and can be smoothed using the Ujw J}j
Candela Options dialog box. The iso-candela plots can be presented as false c(:qid
color maps or contour plots. The distribution plots are graphs of cross-sectional @%8Xa7+
curves through the candela distribution. OB-2x mZW
The orientation of the candela plots is determined by the Normal Vector and the ~Z ,b d$
Up Vector, as specified in the Analysis|Candela Options dialog box. The Z33&FUU
normal vector specifies the axis of the candela plot and the up vector specifies Qf?5"=:#
“which way is up.”
