给个英文的.个人理解可能会有点出入.基本上是这个意思. G'w!Aw s
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric >!' ]w{G
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ]sVWQj
radiometric units, an intensity plot is in units of watts per steradian. Candela plots (/]#G8
are commonly used in the design of illumination systems, especially those used in h2Th)&Fb>
the far field. <`; {gX1
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface %
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” tH
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the model and “go off to infinity.” Exiting rays are the collection of ray segments #wR hR>6
following the intersection point of a ray at a surface. Due to ray splitting, several x@bqPZ t
ray segments may contribute to the candela data for each incident ray. Incident pO:]3qv
rays are the collection of ray segments which intersect the selected surface. No A4#F AFy
surface selection is required for Missed rays but one is necessary for Exiting and >C6S2ISSz
Incident rays. 9Sd?,z
The candela plots represent flux versus angle and can be smoothed using the <? !'
Candela Options dialog box. The iso-candela plots can be presented as false Q#qfuwz
color maps or contour plots. The distribution plots are graphs of cross-sectional yOKzw~;0 %
curves through the candela distribution. Xfqin4/jC
The orientation of the candela plots is determined by the Normal Vector and the 6hYz^}2g
Up Vector, as specified in the Analysis|Candela Options dialog box. The M
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normal vector specifies the axis of the candela plot and the up vector specifies [' pO=ho
“which way is up.”
