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`,z4 _
m T /^F{c
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric R=3|(R+kA
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ~d3|zlh
radiometric units, an intensity plot is in units of watts per steradian. Candela plots _< GXR
?
are commonly used in the design of illumination systems, especially those used in q|}O-A*wa
the far field. bcUSjG>
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface jwg*\HO,s
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” "g*`G< W_s
the model and “go off to infinity.” Exiting rays are the collection of ray segments r PTfwhs
following the intersection point of a ray at a surface. Due to ray splitting, several Ng2 Z7k
ray segments may contribute to the candela data for each incident ray. Incident <KJ|U0/jGd
rays are the collection of ray segments which intersect the selected surface. No |l-O e
surface selection is required for Missed rays but one is necessary for Exiting and D ~FIv
Incident rays. e8E ' X
The candela plots represent flux versus angle and can be smoothed using the F1S0C>N?5
Candela Options dialog box. The iso-candela plots can be presented as false w9StW9 4p
color maps or contour plots. The distribution plots are graphs of cross-sectional I/%L,XyRI
curves through the candela distribution. /#z"c] #
The orientation of the candela plots is determined by the Normal Vector and the X f{9rZ+
Up Vector, as specified in the Analysis|Candela Options dialog box. The _kc}:
normal vector specifies the axis of the candela plot and the up vector specifies k8!:`jG
“which way is up.”
