给个英文的.个人理解可能会有点出入.基本上是这个意思. A&{Nh` q
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric :k"]5>(^
units, a luminous intensity plot is in units of candelas (lumens per steradian). In *Ex|9FCt$
radiometric units, an intensity plot is in units of watts per steradian. Candela plots =Qq+4F)MD
are commonly used in the design of illumination systems, especially those used in [aS*%Heu
the far field. %y@AA>x!
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface }u|q0>^8
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ,Q B<7a+I
the model and “go off to infinity.” Exiting rays are the collection of ray segments <3iMRe
following the intersection point of a ray at a surface. Due to ray splitting, several E^PB)D(.
ray segments may contribute to the candela data for each incident ray. Incident ?%86/N>
rays are the collection of ray segments which intersect the selected surface. No ^.tg 7%dJ
surface selection is required for Missed rays but one is necessary for Exiting and \v{=gK
Incident rays. $kgV a ^
The candela plots represent flux versus angle and can be smoothed using the - &f$GUTJ
Candela Options dialog box. The iso-candela plots can be presented as false (hsl~Jf
color maps or contour plots. The distribution plots are graphs of cross-sectional ^aQ"E9
curves through the candela distribution. @x1-!
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The orientation of the candela plots is determined by the Normal Vector and the c,22*.V/
Up Vector, as specified in the Analysis|Candela Options dialog box. The E]6
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normal vector specifies the axis of the candela plot and the up vector specifies neh (< >
“which way is up.”
