给个英文的.个人理解可能会有点出入.基本上是这个意思. X<~k =qwA
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric [J)/Et
units, a luminous intensity plot is in units of candelas (lumens per steradian). In d&[i EU
radiometric units, an intensity plot is in units of watts per steradian. Candela plots .!yWF?T8
are commonly used in the design of illumination systems, especially those used in E3S%s
the far field. -(\1r2
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface B y?nd)
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” #)^^_
the model and “go off to infinity.” Exiting rays are the collection of ray segments .4Qb5I2#
following the intersection point of a ray at a surface. Due to ray splitting, several . [T'yc:=
ray segments may contribute to the candela data for each incident ray. Incident `]`= ] *d
rays are the collection of ray segments which intersect the selected surface. No EI1W
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surface selection is required for Missed rays but one is necessary for Exiting and 2J;kD2"!
Incident rays. K,f* SXM
The candela plots represent flux versus angle and can be smoothed using the 9ZDVy7m\i-
Candela Options dialog box. The iso-candela plots can be presented as false &
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color maps or contour plots. The distribution plots are graphs of cross-sectional Hp btj
curves through the candela distribution. ePp[m
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The orientation of the candela plots is determined by the Normal Vector and the J| SwQE~
Up Vector, as specified in the Analysis|Candela Options dialog box. The X"h%tsuw
normal vector specifies the axis of the candela plot and the up vector specifies k""> 2#V
“which way is up.”
