给个英文的.个人理解可能会有点出入.基本上是这个意思. -XG@'P_
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric I7 ]8Y=xf
units, a luminous intensity plot is in units of candelas (lumens per steradian). In
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots "#g}ve,
are commonly used in the design of illumination systems, especially those used in /PKN LK
the far field. -mh3DhJ,
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface g<qaXv
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” {_*yGK48n
the model and “go off to infinity.” Exiting rays are the collection of ray segments E"IZ6)Q
following the intersection point of a ray at a surface. Due to ray splitting, several ~"A0Rs=
ray segments may contribute to the candela data for each incident ray. Incident c & c@M$
rays are the collection of ray segments which intersect the selected surface. No ' Pbr
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surface selection is required for Missed rays but one is necessary for Exiting and :k#HW6 p
Incident rays. 2~[juWbz
The candela plots represent flux versus angle and can be smoothed using the uQzXfO q
Candela Options dialog box. The iso-candela plots can be presented as false `WS&rmq &'
color maps or contour plots. The distribution plots are graphs of cross-sectional D2O~kN d
curves through the candela distribution. K (|}dl:
The orientation of the candela plots is determined by the Normal Vector and the ;kKyksxlD
Up Vector, as specified in the Analysis|Candela Options dialog box. The %a7$QF]
normal vector specifies the axis of the candela plot and the up vector specifies k}rbim
“which way is up.”
