给个英文的.个人理解可能会有点出入.基本上是这个意思. 7Ipt~K }
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric GY<ErS)2
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ~ ui/Qf2|
radiometric units, an intensity plot is in units of watts per steradian. Candela plots i$;GEM}tv
are commonly used in the design of illumination systems, especially those used in rHPda?&H
the far field. {PgB~|W
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface (A O]f fBU
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” %])- +T
the model and “go off to infinity.” Exiting rays are the collection of ray segments |0FRK D ]
following the intersection point of a ray at a surface. Due to ray splitting, several ,\!4 A
ray segments may contribute to the candela data for each incident ray. Incident EQ`;=I3J9y
rays are the collection of ray segments which intersect the selected surface. No ?g| K"P<1
surface selection is required for Missed rays but one is necessary for Exiting and -cs
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Incident rays. w]]`/`
The candela plots represent flux versus angle and can be smoothed using the *%1:="W*|
Candela Options dialog box. The iso-candela plots can be presented as false Ol H{!
color maps or contour plots. The distribution plots are graphs of cross-sectional .z&V!2zp
curves through the candela distribution. E9pKR+P
The orientation of the candela plots is determined by the Normal Vector and the K K4>8zGR
Up Vector, as specified in the Analysis|Candela Options dialog box. The (q`Jef
normal vector specifies the axis of the candela plot and the up vector specifies ~r;da 9
“which way is up.”
