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>im2AD+e
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ^m1Rw|
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ZTmdS
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ~4`wfOvO
are commonly used in the design of illumination systems, especially those used in NOS5bm&-
the far field. wqGZkFg1
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface i2j)%Gc}
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” *q0N$}k
the model and “go off to infinity.” Exiting rays are the collection of ray segments tIr66'8
following the intersection point of a ray at a surface. Due to ray splitting, several a|7V{pp=M
ray segments may contribute to the candela data for each incident ray. Incident <m(nZ'Zqz2
rays are the collection of ray segments which intersect the selected surface. No 56bB~ =c
surface selection is required for Missed rays but one is necessary for Exiting and |\_O 8=B%
Incident rays. E>g' !
The candela plots represent flux versus angle and can be smoothed using the 2#! $f_
Candela Options dialog box. The iso-candela plots can be presented as false nlY ^
color maps or contour plots. The distribution plots are graphs of cross-sectional B)-S@.u
curves through the candela distribution. d=5D 9' +
The orientation of the candela plots is determined by the Normal Vector and the *Cb(4h -
Up Vector, as specified in the Analysis|Candela Options dialog box. The X&lk A
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normal vector specifies the axis of the candela plot and the up vector specifies vGAPQg6*
“which way is up.”
