给个英文的.个人理解可能会有点出入.基本上是这个意思. l#v52
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 4Us,DS_/
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ~
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots ~;$QSO\2h
are commonly used in the design of illumination systems, especially those used in o N A ]G]
the far field. >>J$`0kM*
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface HN`qMGW^
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” %,vq@..^
the model and “go off to infinity.” Exiting rays are the collection of ray segments ~{{S<S
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following the intersection point of a ray at a surface. Due to ray splitting, several
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ray segments may contribute to the candela data for each incident ray. Incident 2Cy,#X%j>
rays are the collection of ray segments which intersect the selected surface. No Q]=/e7
surface selection is required for Missed rays but one is necessary for Exiting and 7W SP0Xyz
Incident rays. i ? pd|J
The candela plots represent flux versus angle and can be smoothed using the M} X `
Candela Options dialog box. The iso-candela plots can be presented as false H%l-@::+$
color maps or contour plots. The distribution plots are graphs of cross-sectional LYYz=oZOE!
curves through the candela distribution. ~v\
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The orientation of the candela plots is determined by the Normal Vector and the QlB9m2XB
Up Vector, as specified in the Analysis|Candela Options dialog box. The .
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normal vector specifies the axis of the candela plot and the up vector specifies mYo~RXKGF
“which way is up.”
