给个英文的.个人理解可能会有点出入.基本上是这个意思. y/+y |.Xg
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ,u14R]
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Qd}h:U ^
radiometric units, an intensity plot is in units of watts per steradian. Candela plots %t$) sg]
are commonly used in the design of illumination systems, especially those used in ")w~pZE&+
the far field. #c-Jo[%G
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 2gnz =
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Ub[UB%(T
the model and “go off to infinity.” Exiting rays are the collection of ray segments #*G}v%Ow/u
following the intersection point of a ray at a surface. Due to ray splitting, several 'f6!a5q C
ray segments may contribute to the candela data for each incident ray. Incident Ex{;&UWm
rays are the collection of ray segments which intersect the selected surface. No mHNqzdaa
surface selection is required for Missed rays but one is necessary for Exiting and =BzBM` -o
Incident rays. r1sA^2g.
The candela plots represent flux versus angle and can be smoothed using the "rw'mogRL
Candela Options dialog box. The iso-candela plots can be presented as false oB+@05m8
color maps or contour plots. The distribution plots are graphs of cross-sectional `U{#;
curves through the candela distribution. >9[wjB2?}
The orientation of the candela plots is determined by the Normal Vector and the E,[v%Xw
Up Vector, as specified in the Analysis|Candela Options dialog box. The $ccCI
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normal vector specifies the axis of the candela plot and the up vector specifies Bhe0z|&
“which way is up.”
