给个英文的.个人理解可能会有点出入.基本上是这个意思. x 4+WZYv3
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric o>r
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In {P8d^=#q
radiometric units, an intensity plot is in units of watts per steradian. Candela plots y>y2,x+[
are commonly used in the design of illumination systems, especially those used in ?.S Gn[
the far field. #{}?=/nJ~-
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” m"n74 cxS
the model and “go off to infinity.” Exiting rays are the collection of ray segments ?>h
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following the intersection point of a ray at a surface. Due to ray splitting, several [t?tLUg|6
ray segments may contribute to the candela data for each incident ray. Incident x
vs= T
rays are the collection of ray segments which intersect the selected surface. No @& }}tALi
surface selection is required for Missed rays but one is necessary for Exiting and {s
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Incident rays. B?z2@,
The candela plots represent flux versus angle and can be smoothed using the FM VAXOO
Candela Options dialog box. The iso-candela plots can be presented as false >[;W ~*
color maps or contour plots. The distribution plots are graphs of cross-sectional Ic2?1<I ZA
curves through the candela distribution. +& B? f
The orientation of the candela plots is determined by the Normal Vector and the [ [ ie
Up Vector, as specified in the Analysis|Candela Options dialog box. The qS vV |G
normal vector specifies the axis of the candela plot and the up vector specifies |#2WN-
“which way is up.”
