给个英文的.个人理解可能会有点出入.基本上是这个意思. 45,): U5
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Yyr
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In 'ti ~TG
radiometric units, an intensity plot is in units of watts per steradian. Candela plots bess
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are commonly used in the design of illumination systems, especially those used in UhKd o
the far field. kaT
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Ox5Es
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” )H>?K0I
the model and “go off to infinity.” Exiting rays are the collection of ray segments :O' QL,
following the intersection point of a ray at a surface. Due to ray splitting, several j "s 7P%
ray segments may contribute to the candela data for each incident ray. Incident
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rays are the collection of ray segments which intersect the selected surface. No I/*^ s
surface selection is required for Missed rays but one is necessary for Exiting and _P`
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Incident rays. .k-t5d
The candela plots represent flux versus angle and can be smoothed using the x[y}{ T
Candela Options dialog box. The iso-candela plots can be presented as false G=F _{z\ }
color maps or contour plots. The distribution plots are graphs of cross-sectional <])]1r8
curves through the candela distribution. {4$aA*
The orientation of the candela plots is determined by the Normal Vector and the <N:)Xf9`
Up Vector, as specified in the Analysis|Candela Options dialog box. The 8wrO64_NO
normal vector specifies the axis of the candela plot and the up vector specifies I
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“which way is up.”
