给个英文的.个人理解可能会有点出入.基本上是这个意思. VnjhEEM!
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric `>HM<Nn-0
units, a luminous intensity plot is in units of candelas (lumens per steradian). In [Sj _=
radiometric units, an intensity plot is in units of watts per steradian. Candela plots } s@
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are commonly used in the design of illumination systems, especially those used in **,(>4 j
the far field. 8I>'x f
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface l:@`.'-=
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” B;vpG?s{ 9
the model and “go off to infinity.” Exiting rays are the collection of ray segments MD4RSl<F
following the intersection point of a ray at a surface. Due to ray splitting, several K/flg|uZ/V
ray segments may contribute to the candela data for each incident ray. Incident =qJlSb
rays are the collection of ray segments which intersect the selected surface. No Wr j<}L|
surface selection is required for Missed rays but one is necessary for Exiting and Ii .0Bul
Incident rays. x(]Um!
The candela plots represent flux versus angle and can be smoothed using the ln1QY"g
Candela Options dialog box. The iso-candela plots can be presented as false r(ZMZ^
color maps or contour plots. The distribution plots are graphs of cross-sectional - X]?ql*%`
curves through the candela distribution. Ii.?|
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The orientation of the candela plots is determined by the Normal Vector and the s u}n3NsJ
Up Vector, as specified in the Analysis|Candela Options dialog box. The ku3(cb!2
normal vector specifies the axis of the candela plot and the up vector specifies I)(@'^)
“which way is up.”
