给个英文的.个人理解可能会有点出入.基本上是这个意思. ] r6BLZ[ %
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 3_\{[_ W
units, a luminous intensity plot is in units of candelas (lumens per steradian). In De
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots vf' cx :m
are commonly used in the design of illumination systems, especially those used in 8S1P&+iKs
the far field. UhSh(E8p>
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface @bW[J
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” RJRq` T|m
the model and “go off to infinity.” Exiting rays are the collection of ray segments Uc&6=5~Ys\
following the intersection point of a ray at a surface. Due to ray splitting, several `o_f UOe8a
ray segments may contribute to the candela data for each incident ray. Incident tSb?]J
rays are the collection of ray segments which intersect the selected surface. No uojh%@. 4
surface selection is required for Missed rays but one is necessary for Exiting and ^s2m\Q(
Incident rays. Q\27\2
The candela plots represent flux versus angle and can be smoothed using the Ac[|MBaF
Candela Options dialog box. The iso-candela plots can be presented as false p` ADro*
color maps or contour plots. The distribution plots are graphs of cross-sectional m +Q5vkW
curves through the candela distribution. Fo e>}6~{?
The orientation of the candela plots is determined by the Normal Vector and the x A&
Up Vector, as specified in the Analysis|Candela Options dialog box. The XJmFJafQD
normal vector specifies the axis of the candela plot and the up vector specifies ,yk PQz O
“which way is up.”
