给个英文的.个人理解可能会有点出入.基本上是这个意思. =GR 'V
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric r SV gWr8
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Cpx+qQt0
radiometric units, an intensity plot is in units of watts per steradian. Candela plots q\9d6u=Gm
are commonly used in the design of illumination systems, especially those used in 4-v6=gz.
the far field. R
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 1q.(69M
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” J0220 _
the model and “go off to infinity.” Exiting rays are the collection of ray segments 2)/NFZ
following the intersection point of a ray at a surface. Due to ray splitting, several l!IKUzt )7
ray segments may contribute to the candela data for each incident ray. Incident {b!7
.Cd=
rays are the collection of ray segments which intersect the selected surface. No 84&XW
surface selection is required for Missed rays but one is necessary for Exiting and uL?vG6% ^1
Incident rays. YT yX`Y#
The candela plots represent flux versus angle and can be smoothed using the K6pR8z*?
Candela Options dialog box. The iso-candela plots can be presented as false 5@u~3jPd
color maps or contour plots. The distribution plots are graphs of cross-sectional KhM.Tc
curves through the candela distribution. J^3H7 ]
The orientation of the candela plots is determined by the Normal Vector and the CHaE;olo
Up Vector, as specified in the Analysis|Candela Options dialog box. The *i<\iMoW
normal vector specifies the axis of the candela plot and the up vector specifies pvXcLR)L+3
“which way is up.”
