给个英文的.个人理解可能会有点出入.基本上是这个意思. q<cxmo0S
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ( Y
units, a luminous intensity plot is in units of candelas (lumens per steradian). In &pH XSU
radiometric units, an intensity plot is in units of watts per steradian. Candela plots l=<},_]{
are commonly used in the design of illumination systems, especially those used in =0>[-:Z
the far field. ]<u%jTQREd
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Tz7|OV_W$
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” aX*7tRn_%
the model and “go off to infinity.” Exiting rays are the collection of ray segments EnEaUb?P
following the intersection point of a ray at a surface. Due to ray splitting, several )g ?'Nz
ray segments may contribute to the candela data for each incident ray. Incident }-p-(
rays are the collection of ray segments which intersect the selected surface. No
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surface selection is required for Missed rays but one is necessary for Exiting and }synU]^7\
Incident rays. q,=YKw)*
The candela plots represent flux versus angle and can be smoothed using the 6Z;D`X,5
Candela Options dialog box. The iso-candela plots can be presented as false eRg;)[#0>$
color maps or contour plots. The distribution plots are graphs of cross-sectional C-H6l6,
curves through the candela distribution. +a^0Q
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The orientation of the candela plots is determined by the Normal Vector and the &x/Z {ut
Up Vector, as specified in the Analysis|Candela Options dialog box. The cea e~
normal vector specifies the axis of the candela plot and the up vector specifies &Zo +F]3d
“which way is up.”
