给个英文的.个人理解可能会有点出入.基本上是这个意思. %b2Hm9r+
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric }X/YMgJ
units, a luminous intensity plot is in units of candelas (lumens per steradian). In {F S)f
radiometric units, an intensity plot is in units of watts per steradian. Candela plots VJ_fA}U
are commonly used in the design of illumination systems, especially those used in OhlK;hvdB*
the far field. fNfa.0 s
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface R0LWuE%eD
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 0,Ib74N'w
the model and “go off to infinity.” Exiting rays are the collection of ray segments a'. 7)f[g}
following the intersection point of a ray at a surface. Due to ray splitting, several k GYsjhL\d
ray segments may contribute to the candela data for each incident ray. Incident `"<hO
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rays are the collection of ray segments which intersect the selected surface. No }^ j8<
surface selection is required for Missed rays but one is necessary for Exiting and e4tC[6 ;
Incident rays.
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The candela plots represent flux versus angle and can be smoothed using the )=MK&7 2r
Candela Options dialog box. The iso-candela plots can be presented as false d 2^/
color maps or contour plots. The distribution plots are graphs of cross-sectional *<6dB#'
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curves through the candela distribution. 1eEML"
The orientation of the candela plots is determined by the Normal Vector and the GIn%yB'
Up Vector, as specified in the Analysis|Candela Options dialog box. The `!(%R k
normal vector specifies the axis of the candela plot and the up vector specifies MI(; 0
“which way is up.”
