给个英文的.个人理解可能会有点出入.基本上是这个意思. &&Uc%vIN
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric >" z$p@7
units, a luminous intensity plot is in units of candelas (lumens per steradian). In [!<W{ ($5
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ^L,Uz:[J
are commonly used in the design of illumination systems, especially those used in vi4l mkyh^
the far field. )zKZ<;#y
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface UhI T!x
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 8B*XXFy\
the model and “go off to infinity.” Exiting rays are the collection of ray segments ^z _m<&r
following the intersection point of a ray at a surface. Due to ray splitting, several vg.K-"yQW
ray segments may contribute to the candela data for each incident ray. Incident iB1+4wa
rays are the collection of ray segments which intersect the selected surface. No ?}n\&|+
surface selection is required for Missed rays but one is necessary for Exiting and 5LkpfmR
Incident rays. .# 4 ;em%7
The candela plots represent flux versus angle and can be smoothed using the odm!}stus
Candela Options dialog box. The iso-candela plots can be presented as false R9!GDKts%
color maps or contour plots. The distribution plots are graphs of cross-sectional L] syD n
curves through the candela distribution. /'ukeK+'
The orientation of the candela plots is determined by the Normal Vector and the 5, j&-{ 0W
Up Vector, as specified in the Analysis|Candela Options dialog box. The Yu`KHvur
normal vector specifies the axis of the candela plot and the up vector specifies 8iIz!l%O
“which way is up.”
