给个英文的.个人理解可能会有点出入.基本上是这个意思. wlKpHd*
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric #=t:xEz
units, a luminous intensity plot is in units of candelas (lumens per steradian). In }Sp MHR`
radiometric units, an intensity plot is in units of watts per steradian. Candela plots n2 ,b~S\e
are commonly used in the design of illumination systems, especially those used in >!? f6
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the far field. \"Sqr(~_
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface mMT7`r;l
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 7-e)V{A`w
the model and “go off to infinity.” Exiting rays are the collection of ray segments Mw 'd<{
following the intersection point of a ray at a surface. Due to ray splitting, several Bb:jy !jq_
ray segments may contribute to the candela data for each incident ray. Incident u# =N8
rays are the collection of ray segments which intersect the selected surface. No h"%6tp V-
surface selection is required for Missed rays but one is necessary for Exiting and N.eSf
Incident rays. zCvR/
The candela plots represent flux versus angle and can be smoothed using the m}Tu^d y
Candela Options dialog box. The iso-candela plots can be presented as false D zDt:.JZ
color maps or contour plots. The distribution plots are graphs of cross-sectional 3)0*hq&83
curves through the candela distribution. "c\T
The orientation of the candela plots is determined by the Normal Vector and the l`$f@'k
Up Vector, as specified in the Analysis|Candela Options dialog box. The Pn 7oQ A\
normal vector specifies the axis of the candela plot and the up vector specifies qLYv=h$,
“which way is up.”
