给个英文的.个人理解可能会有点出入.基本上是这个意思. i6A9|G$H
`a:3S@n(}
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 9=j) g
units, a luminous intensity plot is in units of candelas (lumens per steradian). In [KFCc_:
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ByuBZ!m
are commonly used in the design of illumination systems, especially those used in S*>T%#F6Uo
the far field. R8: 5N3Fx
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface VM:|I~gJ
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 2NJ\`1HZ\
the model and “go off to infinity.” Exiting rays are the collection of ray segments 7R7+jL ,
following the intersection point of a ray at a surface. Due to ray splitting, several /Wcx%P
ray segments may contribute to the candela data for each incident ray. Incident z;dRzw L
rays are the collection of ray segments which intersect the selected surface. No $+f=l~/s
surface selection is required for Missed rays but one is necessary for Exiting and _;U %`/T b
Incident rays. Ssuz%*
The candela plots represent flux versus angle and can be smoothed using the 'e*w8h
Candela Options dialog box. The iso-candela plots can be presented as false ^<qi&*
color maps or contour plots. The distribution plots are graphs of cross-sectional |:&O!36
curves through the candela distribution. P[-do
The orientation of the candela plots is determined by the Normal Vector and the
mhX66R
Up Vector, as specified in the Analysis|Candela Options dialog box. The 5 2 Qr
normal vector specifies the axis of the candela plot and the up vector specifies 122s 7A
“which way is up.”
