给个英文的.个人理解可能会有点出入.基本上是这个意思. ){mqo%{SO
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric N MkOx$
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 9e.v[K ~
radiometric units, an intensity plot is in units of watts per steradian. Candela plots q sEFf(9G
are commonly used in the design of illumination systems, especially those used in Dy5 &-yk
the far field. },X.a@:
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface N
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” y%9Hu
the model and “go off to infinity.” Exiting rays are the collection of ray segments +P +h$gQ
following the intersection point of a ray at a surface. Due to ray splitting, several -p0* R<t
ray segments may contribute to the candela data for each incident ray. Incident > {d9z9O
rays are the collection of ray segments which intersect the selected surface. No ^:$ShbX"P
surface selection is required for Missed rays but one is necessary for Exiting and djoP`r
Incident rays. hVyeHbx
The candela plots represent flux versus angle and can be smoothed using the Vug[q=i
Candela Options dialog box. The iso-candela plots can be presented as false C[{E8Tg/
color maps or contour plots. The distribution plots are graphs of cross-sectional _s<BXj
curves through the candela distribution. mz x$(u
The orientation of the candela plots is determined by the Normal Vector and the pm9sI4S
Up Vector, as specified in the Analysis|Candela Options dialog box. The G,+3(C
normal vector specifies the axis of the candela plot and the up vector specifies ~233{vh$=>
“which way is up.”
