给个英文的.个人理解可能会有点出入.基本上是这个意思. d%_OT0Ei
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric N I aFI(
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 3Fs5RC~a
radiometric units, an intensity plot is in units of watts per steradian. Candela plots SJ?cI! =x
are commonly used in the design of illumination systems, especially those used in = &tmP
the far field. ]fBUT6
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface .fAv*pUzU
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” @n -r-Q
the model and “go off to infinity.” Exiting rays are the collection of ray segments ^7^N}x@
following the intersection point of a ray at a surface. Due to ray splitting, several .uF[C{RnO
ray segments may contribute to the candela data for each incident ray. Incident Jrxz'9qRG
rays are the collection of ray segments which intersect the selected surface. No q?):oJ
surface selection is required for Missed rays but one is necessary for Exiting and $pyOn2}
Incident rays. G2Vv i[c
The candela plots represent flux versus angle and can be smoothed using the C 0j j(ku&
Candela Options dialog box. The iso-candela plots can be presented as false &V7M}@
color maps or contour plots. The distribution plots are graphs of cross-sectional xt fBfA
curves through the candela distribution. v{aq`uH
The orientation of the candela plots is determined by the Normal Vector and the b2,!g }I
Up Vector, as specified in the Analysis|Candela Options dialog box. The q_kdCO{:df
normal vector specifies the axis of the candela plot and the up vector specifies *`_{
“which way is up.”
