给个英文的.个人理解可能会有点出入.基本上是这个意思. OT{cP3;0*o
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric nBJ'ak
units, a luminous intensity plot is in units of candelas (lumens per steradian). In @\s*f7
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ~duF2m 72
are commonly used in the design of illumination systems, especially those used in 4(D/~OG-6
the far field. zV yMmw\
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface h"$ )[k~
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” qe<aJn
the model and “go off to infinity.” Exiting rays are the collection of ray segments tqXr6+!Q
following the intersection point of a ray at a surface. Due to ray splitting, several V Bv |7S
ray segments may contribute to the candela data for each incident ray. Incident *9O@DF&*6
rays are the collection of ray segments which intersect the selected surface. No h 1REL^!c
surface selection is required for Missed rays but one is necessary for Exiting and H=v=)cUe[
Incident rays. OD;F{Hc
The candela plots represent flux versus angle and can be smoothed using the g`\ 5!R1
Candela Options dialog box. The iso-candela plots can be presented as false Bx 9v2x.
color maps or contour plots. The distribution plots are graphs of cross-sectional ]wm<$+@
curves through the candela distribution. >7,?X_:A-1
The orientation of the candela plots is determined by the Normal Vector and the ^Cy=L]
Up Vector, as specified in the Analysis|Candela Options dialog box. The B3g # )
normal vector specifies the axis of the candela plot and the up vector specifies ^ZPynduR
“which way is up.”
