给个英文的.个人理解可能会有点出入.基本上是这个意思. hT 1JEu
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ,k~' S~w.
units, a luminous intensity plot is in units of candelas (lumens per steradian). In b9X*2pnWJ
radiometric units, an intensity plot is in units of watts per steradian. Candela plots \mh #MMp
are commonly used in the design of illumination systems, especially those used in CnL=s6XD'
the far field. `W Xlq#:K
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface .\_RavW23
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” tXtNK2-1
the model and “go off to infinity.” Exiting rays are the collection of ray segments I[k"I(
following the intersection point of a ray at a surface. Due to ray splitting, several s.bo;lk
ray segments may contribute to the candela data for each incident ray. Incident '42$O
rays are the collection of ray segments which intersect the selected surface. No 9x@|%4Zm"
surface selection is required for Missed rays but one is necessary for Exiting and ;x\oY6:
Incident rays. g=4^u*
The candela plots represent flux versus angle and can be smoothed using the J6s]vV q"
Candela Options dialog box. The iso-candela plots can be presented as false R]X 0D.
color maps or contour plots. The distribution plots are graphs of cross-sectional S j ~SG
curves through the candela distribution. " ."(<c/3
The orientation of the candela plots is determined by the Normal Vector and the rW L;pM<
Up Vector, as specified in the Analysis|Candela Options dialog box. The
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normal vector specifies the axis of the candela plot and the up vector specifies ?v
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“which way is up.”
