给个英文的.个人理解可能会有点出入.基本上是这个意思. 5auL<Pq
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric |)*m [_1
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 F C~|&
are commonly used in the design of illumination systems, especially those used in WJBW: 2=;
the far field. zww?
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 1h& )I%`?
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” +q 4W0
the model and “go off to infinity.” Exiting rays are the collection of ray segments ~4}*Dhsh
following the intersection point of a ray at a surface. Due to ray splitting, several B/:> {2 cm
ray segments may contribute to the candela data for each incident ray. Incident 01UqD doj
rays are the collection of ray segments which intersect the selected surface. No o&*1U"6D
surface selection is required for Missed rays but one is necessary for Exiting and IZzhJK M1V
Incident rays. (4E.Li<O
The candela plots represent flux versus angle and can be smoothed using the 'JJ1#kKa
Candela Options dialog box. The iso-candela plots can be presented as false /QM0.{Ypl
color maps or contour plots. The distribution plots are graphs of cross-sectional MM/BJ
curves through the candela distribution. M ^ 0w/
The orientation of the candela plots is determined by the Normal Vector and the g%Th_= qy
Up Vector, as specified in the Analysis|Candela Options dialog box. The K[`4vsE
normal vector specifies the axis of the candela plot and the up vector specifies l; .[W|
“which way is up.”
