给个英文的.个人理解可能会有点出入.基本上是这个意思. _yR_u+5
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric IHi[3xf<
units, a luminous intensity plot is in units of candelas (lumens per steradian). In lw}7kp4
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots *QWOW g4w
are commonly used in the design of illumination systems, especially those used in ,dK)I1"C
the far field. C96*,.j~'
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 2gkN\w6zQ
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” j$XaO%y)
the model and “go off to infinity.” Exiting rays are the collection of ray segments <%% )C>l
following the intersection point of a ray at a surface. Due to ray splitting, several $ (xdF
ray segments may contribute to the candela data for each incident ray. Incident &Wb"/Hn2
rays are the collection of ray segments which intersect the selected surface. No }2e s"
surface selection is required for Missed rays but one is necessary for Exiting and .I_<\h7
Incident rays. %C qp88 ]
The candela plots represent flux versus angle and can be smoothed using the <]KQ$8dtD
Candela Options dialog box. The iso-candela plots can be presented as false 1L'Q;?&2H,
color maps or contour plots. The distribution plots are graphs of cross-sectional %kop's&?C
curves through the candela distribution. ABe25Su s
The orientation of the candela plots is determined by the Normal Vector and the kh=<M{ -t
Up Vector, as specified in the Analysis|Candela Options dialog box. The LL
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normal vector specifies the axis of the candela plot and the up vector specifies +[MHl
“which way is up.”
