给个英文的.个人理解可能会有点出入.基本上是这个意思. /J&_ZDNV~
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric q9(hn_X@/
units, a luminous intensity plot is in units of candelas (lumens per steradian). In k|
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots 2K{)8 ;^
are commonly used in the design of illumination systems, especially those used in |b|bL 7nx
the far field. '5P:;zw
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 8o P"?ew#
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” OUm,;WNLf
the model and “go off to infinity.” Exiting rays are the collection of ray segments WAb@d=H{+>
following the intersection point of a ray at a surface. Due to ray splitting, several R=L-Ulhk
ray segments may contribute to the candela data for each incident ray. Incident I$I',x5Z
rays are the collection of ray segments which intersect the selected surface. No stOD5yi
surface selection is required for Missed rays but one is necessary for Exiting and @P<Mc )o^
Incident rays. hDTM\>.c;s
The candela plots represent flux versus angle and can be smoothed using the L^jhr>-";
Candela Options dialog box. The iso-candela plots can be presented as false 6W N(Tw
color maps or contour plots. The distribution plots are graphs of cross-sectional p @+D$
curves through the candela distribution. y~rtYI
The orientation of the candela plots is determined by the Normal Vector and the V}q=!zz
Up Vector, as specified in the Analysis|Candela Options dialog box. The = /=?l
normal vector specifies the axis of the candela plot and the up vector specifies W_| 7hwr
“which way is up.”
