给个英文的.个人理解可能会有点出入.基本上是这个意思. ?e+$?8l[3
&26H
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric # ^oF^!
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ac??lHtH9
radiometric units, an intensity plot is in units of watts per steradian. Candela plots TZ+2S93c
are commonly used in the design of illumination systems, especially those used in sz+Uq]Mn
the far field. JqYt^,,Q:
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Ks-aJ+}
or rays Incident on a surface. Missed rays are a collection of all rays that “leave”
)!(etB=`y
the model and “go off to infinity.” Exiting rays are the collection of ray segments [?U b =sp
following the intersection point of a ray at a surface. Due to ray splitting, several d9sqO9 Ud8
ray segments may contribute to the candela data for each incident ray. Incident bB|P`l L
rays are the collection of ray segments which intersect the selected surface. No (N25.}8 Y
surface selection is required for Missed rays but one is necessary for Exiting and !u=,b fyH
Incident rays. z("Fy
The candela plots represent flux versus angle and can be smoothed using the vswBK-w(Z
Candela Options dialog box. The iso-candela plots can be presented as false 2DbM48\E
color maps or contour plots. The distribution plots are graphs of cross-sectional gC qQ~lWZ
curves through the candela distribution. bP ,_H
The orientation of the candela plots is determined by the Normal Vector and the E)7ODRVbl
Up Vector, as specified in the Analysis|Candela Options dialog box. The :},/ D*v
normal vector specifies the axis of the candela plot and the up vector specifies F"M$ "rC]
“which way is up.”
