给个英文的.个人理解可能会有点出入.基本上是这个意思. d[nz0LI|mk
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric IkxoW:L
units, a luminous intensity plot is in units of candelas (lumens per steradian). In FlY"OU*
radiometric units, an intensity plot is in units of watts per steradian. Candela plots [k&7 h,
are commonly used in the design of illumination systems, especially those used in ?.n1t@sG&
the far field. :_`Yrx5
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface =kCiJ8q|
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” t~BWN
the model and “go off to infinity.” Exiting rays are the collection of ray segments e E (+
following the intersection point of a ray at a surface. Due to ray splitting, several r;E5e]w*-
ray segments may contribute to the candela data for each incident ray. Incident =k;X}/
rays are the collection of ray segments which intersect the selected surface. No q(4Ny<=,'K
surface selection is required for Missed rays but one is necessary for Exiting and Mm1>g~o
Incident rays. c#>:U,j
The candela plots represent flux versus angle and can be smoothed using the i 6y=3k
Candela Options dialog box. The iso-candela plots can be presented as false fI'+4
)@x
color maps or contour plots. The distribution plots are graphs of cross-sectional XqwP<5Z
curves through the candela distribution. EMdU4YnE"
The orientation of the candela plots is determined by the Normal Vector and the edZBQmx+#
Up Vector, as specified in the Analysis|Candela Options dialog box. The 66$ hdT$
normal vector specifies the axis of the candela plot and the up vector specifies ?6L8#"=
“which way is up.”
