给个英文的.个人理解可能会有点出入.基本上是这个意思. yI:
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric sv=U^xI
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 3lp'U&3`5
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ~!Nj DDk
are commonly used in the design of illumination systems, especially those used in XH?//.q
the far field. H4y9\
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Gm B&TD m
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” qk<jvha
the model and “go off to infinity.” Exiting rays are the collection of ray segments K KB+o)*W
following the intersection point of a ray at a surface. Due to ray splitting, several [q?RJm B]
ray segments may contribute to the candela data for each incident ray. Incident 9w=7A>.U
rays are the collection of ray segments which intersect the selected surface. No Ah2 {kK
surface selection is required for Missed rays but one is necessary for Exiting and ?9\D (V
Incident rays. V;%ug'j
The candela plots represent flux versus angle and can be smoothed using the N\PdX$
Candela Options dialog box. The iso-candela plots can be presented as false r'*$'QY-N
color maps or contour plots. The distribution plots are graphs of cross-sectional /i,n75/y?
curves through the candela distribution. ZHNL ~=r}
The orientation of the candela plots is determined by the Normal Vector and the
mWv$eR
Up Vector, as specified in the Analysis|Candela Options dialog box. The \n[kzi7
normal vector specifies the axis of the candela plot and the up vector specifies o.ZR 5 `.
“which way is up.”
