给个英文的.个人理解可能会有点出入.基本上是这个意思. GaG>0 x
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Mh4MaLw
units, a luminous intensity plot is in units of candelas (lumens per steradian). In %Qlc?Wl:
radiometric units, an intensity plot is in units of watts per steradian. Candela plots >#x[qX
are commonly used in the design of illumination systems, especially those used in #YYJ4^":k
the far field. U:C:ugm
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface y'`/^>.
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” V7Cnu:0_
the model and “go off to infinity.” Exiting rays are the collection of ray segments xdm \[s
following the intersection point of a ray at a surface. Due to ray splitting, several l^9gFp~I
ray segments may contribute to the candela data for each incident ray. Incident <cp9+P <
rays are the collection of ray segments which intersect the selected surface. No dY S(}U
surface selection is required for Missed rays but one is necessary for Exiting and
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Incident rays. Ze eV-
The candela plots represent flux versus angle and can be smoothed using the xBVOIc[4(
Candela Options dialog box. The iso-candela plots can be presented as false 3WJk04r
color maps or contour plots. The distribution plots are graphs of cross-sectional ERV]N:(
curves through the candela distribution. d@$| zr6
The orientation of the candela plots is determined by the Normal Vector and the $M 8& &M
Up Vector, as specified in the Analysis|Candela Options dialog box. The 'R79,)|;[
normal vector specifies the axis of the candela plot and the up vector specifies eKvr1m- -
“which way is up.”
