给个英文的.个人理解可能会有点出入.基本上是这个意思. >&k-'`Nw
t0 ?\l)
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric L j$;:/G
units, a luminous intensity plot is in units of candelas (lumens per steradian). In FC"8#*x
radiometric units, an intensity plot is in units of watts per steradian. Candela plots }o{(S%%
are commonly used in the design of illumination systems, especially those used in 29q _BR *:
the far field. 2f_:v6
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ;jTN | i'
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 4xJQ!>6
the model and “go off to infinity.” Exiting rays are the collection of ray segments WM P,\=6k0
following the intersection point of a ray at a surface. Due to ray splitting, several 0 0U> F
ray segments may contribute to the candela data for each incident ray. Incident WOf 4o
rays are the collection of ray segments which intersect the selected surface. No 7v_8_K
surface selection is required for Missed rays but one is necessary for Exiting and N)>ID(}F1
Incident rays. G owH]MO
The candela plots represent flux versus angle and can be smoothed using the 2)~> R
Candela Options dialog box. The iso-candela plots can be presented as false ei5~&
color maps or contour plots. The distribution plots are graphs of cross-sectional gltBC${7wZ
curves through the candela distribution. y18Y:)DkL
The orientation of the candela plots is determined by the Normal Vector and the dnu u&Rv
Up Vector, as specified in the Analysis|Candela Options dialog box. The W`*r>`krVJ
normal vector specifies the axis of the candela plot and the up vector specifies /,Jqmm#s^
“which way is up.”
