给个英文的.个人理解可能会有点出入.基本上是这个意思. U~g@Tf U;
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In &@'V\5G
radiometric units, an intensity plot is in units of watts per steradian. Candela plots &kq7g Cd
are commonly used in the design of illumination systems, especially those used in er\:U0fr#@
the far field. xhD$e=
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface `1p?*9Ssn
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” # 8qyg<F
the model and “go off to infinity.” Exiting rays are the collection of ray segments s#Q _Gu
following the intersection point of a ray at a surface. Due to ray splitting, several 2vXGO|W
ray segments may contribute to the candela data for each incident ray. Incident (E]"Srwh
rays are the collection of ray segments which intersect the selected surface. No d:$G|< uA
surface selection is required for Missed rays but one is necessary for Exiting and Y=WR6!{
Incident rays. g&aT!%QvX+
The candela plots represent flux versus angle and can be smoothed using the }-@I#9
Candela Options dialog box. The iso-candela plots can be presented as false L (Rorf~V
color maps or contour plots. The distribution plots are graphs of cross-sectional ?',}? {"c
curves through the candela distribution. ^*zW"s
The orientation of the candela plots is determined by the Normal Vector and the
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Up Vector, as specified in the Analysis|Candela Options dialog box. The 3 \9][S-B
normal vector specifies the axis of the candela plot and the up vector specifies W.GN0(uG
“which way is up.”
