给个英文的.个人理解可能会有点出入.基本上是这个意思. b6KO_s:'g
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ,3 !D(&
units, a luminous intensity plot is in units of candelas (lumens per steradian). In \#1*r'V8
radiometric units, an intensity plot is in units of watts per steradian. Candela plots %V r vu5
are commonly used in the design of illumination systems, especially those used in Q [g>ee
the far field. %x$1g)
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface zJ-_{GiM*L
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Fk&W*<}/;
the model and “go off to infinity.” Exiting rays are the collection of ray segments ZR|)+W;
following the intersection point of a ray at a surface. Due to ray splitting, several ,&+"|,m
ray segments may contribute to the candela data for each incident ray. Incident .KzGb4U
rays are the collection of ray segments which intersect the selected surface. No j_=A)B?
surface selection is required for Missed rays but one is necessary for Exiting and ii0{$}eoh
Incident rays. NBLiwL37{
The candela plots represent flux versus angle and can be smoothed using the <P)U Ggd
Candela Options dialog box. The iso-candela plots can be presented as false +rT%C&ze
color maps or contour plots. The distribution plots are graphs of cross-sectional um/2.S n>
curves through the candela distribution. Z0o+&3 a6
The orientation of the candela plots is determined by the Normal Vector and the wUU Dq?!k\
Up Vector, as specified in the Analysis|Candela Options dialog box. The < 5 F t3sd
normal vector specifies the axis of the candela plot and the up vector specifies .MoOjx?
“which way is up.”
