给个英文的.个人理解可能会有点出入.基本上是这个意思. z;#DX15Rj
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 8c6dTT4
units, a luminous intensity plot is in units of candelas (lumens per steradian). In b `7vWyp
radiometric units, an intensity plot is in units of watts per steradian. Candela plots V\!6K
are commonly used in the design of illumination systems, especially those used in s5
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the far field. GmON hh(k
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface aR2 Vvo
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” .w.jT"uD!
the model and “go off to infinity.” Exiting rays are the collection of ray segments FS(bEAk}
following the intersection point of a ray at a surface. Due to ray splitting, several wh A
ray segments may contribute to the candela data for each incident ray. Incident x$6` k
rays are the collection of ray segments which intersect the selected surface. No 2NNAsr}L
surface selection is required for Missed rays but one is necessary for Exiting and X q"_^
Incident rays. &$,%6X"
The candela plots represent flux versus angle and can be smoothed using the ? bq S{KF
Candela Options dialog box. The iso-candela plots can be presented as false &{x%"Aq/
color maps or contour plots. The distribution plots are graphs of cross-sectional m,u5S=3A{!
curves through the candela distribution. 5Dhpcgq<<
The orientation of the candela plots is determined by the Normal Vector and the /F(wb_!
Up Vector, as specified in the Analysis|Candela Options dialog box. The #TXN\YNP
normal vector specifies the axis of the candela plot and the up vector specifies (F<VcB
“which way is up.”
