给个英文的.个人理解可能会有点出入.基本上是这个意思. EWIc|b:
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric QaWHz
units, a luminous intensity plot is in units of candelas (lumens per steradian). In F,M"/hnPT
radiometric units, an intensity plot is in units of watts per steradian. Candela plots drKjL o[y
are commonly used in the design of illumination systems, especially those used in K;p<f{PE
the far field. 1/ pA/UVO
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ^}Qj}
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” &3Z.
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the model and “go off to infinity.” Exiting rays are the collection of ray segments H:-A; f!Z
following the intersection point of a ray at a surface. Due to ray splitting, several (\t_Hs::a
ray segments may contribute to the candela data for each incident ray. Incident P5>5ps"iU
rays are the collection of ray segments which intersect the selected surface. No yW^IN8f m
surface selection is required for Missed rays but one is necessary for Exiting and qmA2bw]
Incident rays. X@qk > /
The candela plots represent flux versus angle and can be smoothed using the /;&+ <
}
Candela Options dialog box. The iso-candela plots can be presented as false Y#&0x_Z
color maps or contour plots. The distribution plots are graphs of cross-sectional s)YP%vn#
curves through the candela distribution. [OZ=iz.
The orientation of the candela plots is determined by the Normal Vector and the u'i%~(:$\)
Up Vector, as specified in the Analysis|Candela Options dialog box. The i*CQor6|z
normal vector specifies the axis of the candela plot and the up vector specifies B>Cs&}Y!
“which way is up.”
