给个英文的.个人理解可能会有点出入.基本上是这个意思. J ]Z~.f="
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric &wY$G! P
units, a luminous intensity plot is in units of candelas (lumens per steradian). In pZ \7!rON
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Ng !d 6]
are commonly used in the design of illumination systems, especially those used in 6hd<ys?
the far field. 9)W &yi
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface (&Lt &i _
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ToPjB vD
the model and “go off to infinity.” Exiting rays are the collection of ray segments ; >5` Y8s6
following the intersection point of a ray at a surface. Due to ray splitting, several YI7M%B9Lj
ray segments may contribute to the candela data for each incident ray. Incident !dGu0wE
rays are the collection of ray segments which intersect the selected surface. No *5k40?w
surface selection is required for Missed rays but one is necessary for Exiting and 2YKa <?_
Incident rays. `?N0?;
The candela plots represent flux versus angle and can be smoothed using the N2'aC}
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Candela Options dialog box. The iso-candela plots can be presented as false mgVYKZWL-i
color maps or contour plots. The distribution plots are graphs of cross-sectional M$Z2 "F;
curves through the candela distribution. -j ]k^
The orientation of the candela plots is determined by the Normal Vector and the MA:5'n
Up Vector, as specified in the Analysis|Candela Options dialog box. The P$k*!j_W
normal vector specifies the axis of the candela plot and the up vector specifies D@68_sn
“which way is up.”
