给个英文的.个人理解可能会有点出入.基本上是这个意思. ,wwO0,"y7
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ,/D}a3JD
units, a luminous intensity plot is in units of candelas (lumens per steradian). In xH xTL>,?
radiometric units, an intensity plot is in units of watts per steradian. Candela plots xbm%+
are commonly used in the design of illumination systems, especially those used in !t^DN\\#
the far field. ])o{!}QUl\
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface XTo7fbW*
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” }Nsdk',}
the model and “go off to infinity.” Exiting rays are the collection of ray segments vWZXb `
following the intersection point of a ray at a surface. Due to ray splitting, several 8.[F3Tk=
ray segments may contribute to the candela data for each incident ray. Incident qyv=ot0"~F
rays are the collection of ray segments which intersect the selected surface. No w?8SQI,~X
surface selection is required for Missed rays but one is necessary for Exiting and tqZ+2c<W3
Incident rays. ) ](ls@*
The candela plots represent flux versus angle and can be smoothed using the 1|(Q|
Candela Options dialog box. The iso-candela plots can be presented as false =c'4rJ$+
color maps or contour plots. The distribution plots are graphs of cross-sectional :-B+W9'5
curves through the candela distribution. @ M] _],
The orientation of the candela plots is determined by the Normal Vector and the !g9k9 l
Up Vector, as specified in the Analysis|Candela Options dialog box. The E4L?4>V@\
normal vector specifies the axis of the candela plot and the up vector specifies l6ym <V(1p
“which way is up.”
