给个英文的.个人理解可能会有点出入.基本上是这个意思. ]Kde t"+
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ?Zz'|.l@
units, a luminous intensity plot is in units of candelas (lumens per steradian). In pOga6'aB)
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ;(6P6@+o
are commonly used in the design of illumination systems, especially those used in ,EEPh>cXc
the far field. #[ -\lU|
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 8#LJ * o
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” j@1)K3Hga
the model and “go off to infinity.” Exiting rays are the collection of ray segments QH@>icAb
following the intersection point of a ray at a surface. Due to ray splitting, several $'"8QOnJ?k
ray segments may contribute to the candela data for each incident ray. Incident ~}% ~oT
rays are the collection of ray segments which intersect the selected surface. No 1u }nm;3
surface selection is required for Missed rays but one is necessary for Exiting and oRq!=eUu_
Incident rays. v{;7LXy0
The candela plots represent flux versus angle and can be smoothed using the -5>NE35Cto
Candela Options dialog box. The iso-candela plots can be presented as false l1 +[
color maps or contour plots. The distribution plots are graphs of cross-sectional G&9#*<F$c
curves through the candela distribution. H:S,\D?%2x
The orientation of the candela plots is determined by the Normal Vector and the H+Z SPHs
Up Vector, as specified in the Analysis|Candela Options dialog box. The & a k6zM
normal vector specifies the axis of the candela plot and the up vector specifies y,m2(V
“which way is up.”
