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"K~+<V}
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Hc`)Q vFRW
units, a luminous intensity plot is in units of candelas (lumens per steradian). In E+LAE/v@
radiometric units, an intensity plot is in units of watts per steradian. Candela plots = GN1l[X
are commonly used in the design of illumination systems, especially those used in f tS^|%p
the far field. Y$3 &?LA
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface d5zv8?|X+
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” +Bg$]~ T
the model and “go off to infinity.” Exiting rays are the collection of ray segments v6Vie o=
following the intersection point of a ray at a surface. Due to ray splitting, several oy8L{8?
ray segments may contribute to the candela data for each incident ray. Incident ({XB,Rm
rays are the collection of ray segments which intersect the selected surface. No S G:Fn8
surface selection is required for Missed rays but one is necessary for Exiting and [$PW {d8|
Incident rays. ~#z8 Q{!O
The candela plots represent flux versus angle and can be smoothed using the =Q\z*.5j.
Candela Options dialog box. The iso-candela plots can be presented as false dQX<X}
color maps or contour plots. The distribution plots are graphs of cross-sectional z_Em%X
curves through the candela distribution. #2`ST=#
The orientation of the candela plots is determined by the Normal Vector and the <gvuCydsh
Up Vector, as specified in the Analysis|Candela Options dialog box. The `/ W6, ]
normal vector specifies the axis of the candela plot and the up vector specifies ,t"?~Hl".
“which way is up.”
