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 U"pU>fV@
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric o/ Z
units, a luminous intensity plot is in units of candelas (lumens per steradian). In K/)*P4C-
radiometric units, an intensity plot is in units of watts per steradian. Candela plots t+C9QXY
are commonly used in the design of illumination systems, especially those used in |l5ol @2*
the far field. vFuf{ @P
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface lP$bxUNt
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 1CS [%)-c
the model and “go off to infinity.” Exiting rays are the collection of ray segments ?LE\pk
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following the intersection point of a ray at a surface. Due to ray splitting, several 1eiV[z$?
ray segments may contribute to the candela data for each incident ray. Incident XN+~ g.0
rays are the collection of ray segments which intersect the selected surface. No FdrH,
surface selection is required for Missed rays but one is necessary for Exiting and 5LJUD>f9 Z
Incident rays. Mf [v 7\
The candela plots represent flux versus angle and can be smoothed using the $#|iKi<Y@j
Candela Options dialog box. The iso-candela plots can be presented as false HR0t[*
color maps or contour plots. The distribution plots are graphs of cross-sectional V5 $J
curves through the candela distribution. RY8Ot2DWi
The orientation of the candela plots is determined by the Normal Vector and the 9ure:Dko(Y
Up Vector, as specified in the Analysis|Candela Options dialog box. The a >w@9
normal vector specifies the axis of the candela plot and the up vector specifies ~M@'=Q*~
“which way is up.”
