给个英文的.个人理解可能会有点出入.基本上是这个意思. C+`V?r p=s
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric &AeNrtGu
units, a luminous intensity plot is in units of candelas (lumens per steradian). In #k>A,
radiometric units, an intensity plot is in units of watts per steradian. Candela plots &e*@:5Z:k
are commonly used in the design of illumination systems, especially those used in ;+o6"ky5
the far field. D Vg$rm`
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 8*B+@`
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” $txF|Fj]^A
the model and “go off to infinity.” Exiting rays are the collection of ray segments A yn $,
following the intersection point of a ray at a surface. Due to ray splitting, several ]WcN6|b+
ray segments may contribute to the candela data for each incident ray. Incident DC BN89#
rays are the collection of ray segments which intersect the selected surface. No eMV8`&c'
surface selection is required for Missed rays but one is necessary for Exiting and H;tE=
Incident rays. BjTgZ98J
The candela plots represent flux versus angle and can be smoothed using the ^Ojg}'.Ygv
Candela Options dialog box. The iso-candela plots can be presented as false 6<5:m:KE
color maps or contour plots. The distribution plots are graphs of cross-sectional 4
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curves through the candela distribution. v*As:;D_
The orientation of the candela plots is determined by the Normal Vector and the ~>0H
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Up Vector, as specified in the Analysis|Candela Options dialog box. The ){eQ.yW
normal vector specifies the axis of the candela plot and the up vector specifies Nx*1m
BC
“which way is up.”
