给个英文的.个人理解可能会有点出入.基本上是这个意思. W1ndb:
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric +rhBC
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In BxZ7Bk
radiometric units, an intensity plot is in units of watts per steradian. Candela plots q]*jT b
are commonly used in the design of illumination systems, especially those used in F
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the far field. !X M*y
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface WLta{A?
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” >;VZB/ d
the model and “go off to infinity.” Exiting rays are the collection of ray segments Q
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following the intersection point of a ray at a surface. Due to ray splitting, several uyWw3>
ray segments may contribute to the candela data for each incident ray. Incident rfzzMV
rays are the collection of ray segments which intersect the selected surface. No 3\C +g{}e
surface selection is required for Missed rays but one is necessary for Exiting and {+3g*s/HI
Incident rays. | h+vdE8
The candela plots represent flux versus angle and can be smoothed using the EB6X
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Candela Options dialog box. The iso-candela plots can be presented as false F[W0gjUc
color maps or contour plots. The distribution plots are graphs of cross-sectional koE]\B2A6
curves through the candela distribution. .M ID)PY-
The orientation of the candela plots is determined by the Normal Vector and the ,dVJAV7v
Up Vector, as specified in the Analysis|Candela Options dialog box. The @P i]kWW})
normal vector specifies the axis of the candela plot and the up vector specifies 1'8-+ ?r
“which way is up.”
