给个英文的.个人理解可能会有点出入.基本上是这个意思. vaEAjg*To<
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric hT<:)MG)+K
units, a luminous intensity plot is in units of candelas (lumens per steradian). In B(%bBhs
radiometric units, an intensity plot is in units of watts per steradian. Candela plots D7Nz 3.j
are commonly used in the design of illumination systems, especially those used in Pf]O'G&F
the far field. e`Z3{H}
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface I#tEDeF2
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 'd@Vusq}2
the model and “go off to infinity.” Exiting rays are the collection of ray segments L5*,l`lET
following the intersection point of a ray at a surface. Due to ray splitting, several 6@ HY+RCx
ray segments may contribute to the candela data for each incident ray. Incident 4)3!n*I
rays are the collection of ray segments which intersect the selected surface. No ^D0BG C&&
surface selection is required for Missed rays but one is necessary for Exiting and NR)[,b\v
Incident rays. :4 D#hOI
The candela plots represent flux versus angle and can be smoothed using the !jDqRXi(
Candela Options dialog box. The iso-candela plots can be presented as false ?ixzlDto\
color maps or contour plots. The distribution plots are graphs of cross-sectional UVD ::
curves through the candela distribution. 9/k?Lv
The orientation of the candela plots is determined by the Normal Vector and the !u#o"e<qh
Up Vector, as specified in the Analysis|Candela Options dialog box. The IBzHXa>75
normal vector specifies the axis of the candela plot and the up vector specifies kty,hAXe
“which way is up.”
