给个英文的.个人理解可能会有点出入.基本上是这个意思. @pz2}Hd |
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric [u:_J qf-
units, a luminous intensity plot is in units of candelas (lumens per steradian). In fM{Vy] )J
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ZW"J]"A
are commonly used in the design of illumination systems, especially those used in E*vi@aI
the far field. hZy*E [i
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface |99eD gK,
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 40XI\yE_?
the model and “go off to infinity.” Exiting rays are the collection of ray segments 3*<W`yed
following the intersection point of a ray at a surface. Due to ray splitting, several =Ju}{ bX
ray segments may contribute to the candela data for each incident ray. Incident Pc<ZfO #
rays are the collection of ray segments which intersect the selected surface. No 9Wn0YIc
surface selection is required for Missed rays but one is necessary for Exiting and pppbn]%Ob
Incident rays. dWA7U 6c<
The candela plots represent flux versus angle and can be smoothed using the 78wcMQNX9
Candela Options dialog box. The iso-candela plots can be presented as false kQ+5p Fo3
color maps or contour plots. The distribution plots are graphs of cross-sectional 04:Dbt~=?p
curves through the candela distribution. @z.!Dby
The orientation of the candela plots is determined by the Normal Vector and the <V{BRRx
Up Vector, as specified in the Analysis|Candela Options dialog box. The M-_)CR
normal vector specifies the axis of the candela plot and the up vector specifies #<{MtK_
“which way is up.”
