给个英文的.个人理解可能会有点出入.基本上是这个意思. Ycb<'M*jE
p '{ `Uvr
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric KLBV(`MS
units, a luminous intensity plot is in units of candelas (lumens per steradian). In #u+BjuZo
radiometric units, an intensity plot is in units of watts per steradian. Candela plots FxOhF03\=[
are commonly used in the design of illumination systems, especially those used in ?#]K54?
the far field. 1xK'T_[
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface [;B_ENV
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” rC] jz$sle
the model and “go off to infinity.” Exiting rays are the collection of ray segments Cnf;5/
following the intersection point of a ray at a surface. Due to ray splitting, several bu"Jb4_a>
ray segments may contribute to the candela data for each incident ray. Incident 01I5,Dm
rays are the collection of ray segments which intersect the selected surface. No A?Jm59{w
surface selection is required for Missed rays but one is necessary for Exiting and ixN>KwH
Incident rays. %Fb"&F^7
The candela plots represent flux versus angle and can be smoothed using the b!hxx Z
Candela Options dialog box. The iso-candela plots can be presented as false u E:#m.Q
color maps or contour plots. The distribution plots are graphs of cross-sectional ;@K,>$ur-
curves through the candela distribution. {y0*cC
The orientation of the candela plots is determined by the Normal Vector and the #I9 |>XE1
Up Vector, as specified in the Analysis|Candela Options dialog box. The EVmQ"PKL'
normal vector specifies the axis of the candela plot and the up vector specifies #FF5xe
“which way is up.”
