给个英文的.个人理解可能会有点出入.基本上是这个意思. |nN{XjNfP5
to 1{7q
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric dT%$"sj5
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 3YG[~o|4
radiometric units, an intensity plot is in units of watts per steradian. Candela plots R N1q/H |
are commonly used in the design of illumination systems, especially those used in wW~y?A"{2
the far field. )@xHL]!5m
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface G 1 r sd
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ,{HxX0
the model and “go off to infinity.” Exiting rays are the collection of ray segments hZE" 8%\q
following the intersection point of a ray at a surface. Due to ray splitting, several ' {L5 3cH=
ray segments may contribute to the candela data for each incident ray. Incident g{zvks~it
rays are the collection of ray segments which intersect the selected surface. No =7JvS ~s
surface selection is required for Missed rays but one is necessary for Exiting and S0\;FmLIc
Incident rays. @{_L38. Nw
The candela plots represent flux versus angle and can be smoothed using the ) ")_aA
Candela Options dialog box. The iso-candela plots can be presented as false ) x/Spb
color maps or contour plots. The distribution plots are graphs of cross-sectional Dk!;s8}*c
curves through the candela distribution. lw4#xH-?
The orientation of the candela plots is determined by the Normal Vector and the G6C#M-S
Up Vector, as specified in the Analysis|Candela Options dialog box. The y mdZ#I-
normal vector specifies the axis of the candela plot and the up vector specifies d;3/Vr$t=
“which way is up.”
