给个英文的.个人理解可能会有点出入.基本上是这个意思. P|`8}|}a
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ` #0:gEo
units, a luminous intensity plot is in units of candelas (lumens per steradian). In *9
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots 7lTC{7C57
are commonly used in the design of illumination systems, especially those used in 5 ; C|
the far field. ]dVGUG8
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface t 6rRU~;}
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” F k7?xc
the model and “go off to infinity.” Exiting rays are the collection of ray segments 39c2pV[
following the intersection point of a ray at a surface. Due to ray splitting, several '(6z.
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ray segments may contribute to the candela data for each incident ray. Incident XE RUo
rays are the collection of ray segments which intersect the selected surface. No /|w6:;$;mn
surface selection is required for Missed rays but one is necessary for Exiting and OH N _
Incident rays. SZ7:u895E
The candela plots represent flux versus angle and can be smoothed using the H.P_ ]3f
Candela Options dialog box. The iso-candela plots can be presented as false a9e>i U
color maps or contour plots. The distribution plots are graphs of cross-sectional t
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curves through the candela distribution. 2F[ q).
The orientation of the candela plots is determined by the Normal Vector and the E#RDqL*J
Up Vector, as specified in the Analysis|Candela Options dialog box. The sQ3 [<
normal vector specifies the axis of the candela plot and the up vector specifies %jJG >T
“which way is up.”
