给个英文的.个人理解可能会有点出入.基本上是这个意思. <=|^\r
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric a\m=E#G
units, a luminous intensity plot is in units of candelas (lumens per steradian). In kJB:=iq/x$
radiometric units, an intensity plot is in units of watts per steradian. Candela plots j{FRD8]V
are commonly used in the design of illumination systems, especially those used in \h[*o eh
the far field. en|~`]HF
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface fCu;n%
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 5+{oQs_
the model and “go off to infinity.” Exiting rays are the collection of ray segments j8Q_s/n
following the intersection point of a ray at a surface. Due to ray splitting, several sE]z.Po=
ray segments may contribute to the candela data for each incident ray. Incident O =}
rays are the collection of ray segments which intersect the selected surface. No Zt41f PQ
surface selection is required for Missed rays but one is necessary for Exiting and ,^
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Incident rays. T*B`8P
The candela plots represent flux versus angle and can be smoothed using the V G7#C@>Z
Candela Options dialog box. The iso-candela plots can be presented as false &b:y#gvJ:
color maps or contour plots. The distribution plots are graphs of cross-sectional rgXX,+cO
curves through the candela distribution. 1h`F* :nva
The orientation of the candela plots is determined by the Normal Vector and the Edc3YSg%;
Up Vector, as specified in the Analysis|Candela Options dialog box. The 3s]o~I 2x
normal vector specifies the axis of the candela plot and the up vector specifies }Uj-R3]}K
“which way is up.”
