给个英文的.个人理解可能会有点出入.基本上是这个意思. cz$c)It
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 3$;J0{&[i
units, a luminous intensity plot is in units of candelas (lumens per steradian). In O$YJku
radiometric units, an intensity plot is in units of watts per steradian. Candela plots f.sPE8#3=
are commonly used in the design of illumination systems, especially those used in /]P%b K6B
the far field. 6CCZda@
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface !:&2+%
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” zv>ZrFl*
the model and “go off to infinity.” Exiting rays are the collection of ray segments WReYF+Uen
following the intersection point of a ray at a surface. Due to ray splitting, several (gFQK[
ray segments may contribute to the candela data for each incident ray. Incident yZQ1]
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rays are the collection of ray segments which intersect the selected surface. No A7mMgb_
surface selection is required for Missed rays but one is necessary for Exiting and H;4oZ[g
Incident rays. 34HFrMi
The candela plots represent flux versus angle and can be smoothed using the 3~#Z E;>#
Candela Options dialog box. The iso-candela plots can be presented as false *vEU}SxRuv
color maps or contour plots. The distribution plots are graphs of cross-sectional jp"XS
curves through the candela distribution. Ey
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The orientation of the candela plots is determined by the Normal Vector and the MAl{66
Up Vector, as specified in the Analysis|Candela Options dialog box. The ,!xz*o+#@
normal vector specifies the axis of the candela plot and the up vector specifies # r2$ZCo3o
“which way is up.”