给个英文的.个人理解可能会有点出入.基本上是这个意思. G5aieD.#
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric PV\+P6aIb
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 4UvZ)^r
radiometric units, an intensity plot is in units of watts per steradian. Candela plots [b>Fn%y
are commonly used in the design of illumination systems, especially those used in %r}{hq4
the far field. {NFr]LGOp
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface BB*f4z$Y%
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ?6un4EVL{
the model and “go off to infinity.” Exiting rays are the collection of ray segments {rH@gz|@i
following the intersection point of a ray at a surface. Due to ray splitting, several mA+&Io
ray segments may contribute to the candela data for each incident ray. Incident Q)" Nu.m
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rays are the collection of ray segments which intersect the selected surface. No h!.^?NF
surface selection is required for Missed rays but one is necessary for Exiting and q?DTMK x
Incident rays. < [\`qX
The candela plots represent flux versus angle and can be smoothed using the 1o;J,dYu
Candela Options dialog box. The iso-candela plots can be presented as false +|'c>,?2H
color maps or contour plots. The distribution plots are graphs of cross-sectional au+kNF|Q
curves through the candela distribution. ``Dq
The orientation of the candela plots is determined by the Normal Vector and the _%!c+f7
Up Vector, as specified in the Analysis|Candela Options dialog box. The v )l8@.
normal vector specifies the axis of the candela plot and the up vector specifies T| V:$D'
“which way is up.”
