给个英文的.个人理解可能会有点出入.基本上是这个意思. e<DcuF<ZS
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric .mnkV -m
units, a luminous intensity plot is in units of candelas (lumens per steradian). In `MT.<5H
radiometric units, an intensity plot is in units of watts per steradian. Candela plots MHE/#G
are commonly used in the design of illumination systems, especially those used in Y;\@
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the far field. u$qasII
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface >d;U>P5.
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” T2?.o.&u
the model and “go off to infinity.” Exiting rays are the collection of ray segments 7iy 2V;}
following the intersection point of a ray at a surface. Due to ray splitting, several r{*Qsaw
ray segments may contribute to the candela data for each incident ray. Incident #.FhN x
rays are the collection of ray segments which intersect the selected surface. No {#t7lV'4
surface selection is required for Missed rays but one is necessary for Exiting and a'q&[08
Incident rays. iqF|IVPoi
The candela plots represent flux versus angle and can be smoothed using the 7#HSe#0J
Candela Options dialog box. The iso-candela plots can be presented as false a/CY@V-
color maps or contour plots. The distribution plots are graphs of cross-sectional ^Ux.s Q
curves through the candela distribution. "6~+-_:
The orientation of the candela plots is determined by the Normal Vector and the jJ
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Up Vector, as specified in the Analysis|Candela Options dialog box. The Qp@}v7Due
normal vector specifies the axis of the candela plot and the up vector specifies PE_JO(e;Xm
“which way is up.”