给个英文的.个人理解可能会有点出入.基本上是这个意思. Z `\7B e
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric gy =`c MS@
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 8v^i%Gg
radiometric units, an intensity plot is in units of watts per steradian. Candela plots b "FsT
are commonly used in the design of illumination systems, especially those used in T (2,iG8
the far field. }BogE$tc
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface "}HQ)54&
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” W=EO=}l#
the model and “go off to infinity.” Exiting rays are the collection of ray segments 8&C(0H]1
following the intersection point of a ray at a surface. Due to ray splitting, several pn $50c
ray segments may contribute to the candela data for each incident ray. Incident 1M;)$m:
rays are the collection of ray segments which intersect the selected surface. No VvF&E>f C
surface selection is required for Missed rays but one is necessary for Exiting and 93WYZNpX
Incident rays. d}o1 j
The candela plots represent flux versus angle and can be smoothed using the zRJy3/>
Candela Options dialog box. The iso-candela plots can be presented as false hE6tu'
color maps or contour plots. The distribution plots are graphs of cross-sectional 2mlE;.}8
curves through the candela distribution. #P9VX5Tg
The orientation of the candela plots is determined by the Normal Vector and the fBLd5
Up Vector, as specified in the Analysis|Candela Options dialog box. The 8&UuwZ6i-
normal vector specifies the axis of the candela plot and the up vector specifies ,xh9,EpBk
“which way is up.”
