给个英文的.个人理解可能会有点出入.基本上是这个意思. )/h~csy:~
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric *p{wC
r
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Dh0`t@
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ;"=a-$vm
are commonly used in the design of illumination systems, especially those used in DG&14c>g
the far field. P ?dE\Po7
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface $VYMAk&\
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” t%<nS=u
the model and “go off to infinity.” Exiting rays are the collection of ray segments b >AFhj :
following the intersection point of a ray at a surface. Due to ray splitting, several *upl*zFf0
ray segments may contribute to the candela data for each incident ray. Incident {w.rcObIw+
rays are the collection of ray segments which intersect the selected surface. No bNR}Mk]?
surface selection is required for Missed rays but one is necessary for Exiting and |a #4
Incident rays. CRvUD.D
The candela plots represent flux versus angle and can be smoothed using the _>B0q|]j4'
Candela Options dialog box. The iso-candela plots can be presented as false EoqUFa,
color maps or contour plots. The distribution plots are graphs of cross-sectional 8
M3Q8&
curves through the candela distribution. ?fDF Rms
The orientation of the candela plots is determined by the Normal Vector and the -crKBy
Up Vector, as specified in the Analysis|Candela Options dialog box. The d !
A)H<Zt
normal vector specifies the axis of the candela plot and the up vector specifies @a)
x^d
“which way is up.”
