给个英文的.个人理解可能会有点出入.基本上是这个意思.
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric w=}uwvn NX
units, a luminous intensity plot is in units of candelas (lumens per steradian). In e5OsI Vtjr
radiometric units, an intensity plot is in units of watts per steradian. Candela plots CT\;xt,S
are commonly used in the design of illumination systems, especially those used in @o-B{ EH8
the far field. z.6$W^
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface |Xw/E) jA
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” _ ib"b#
the model and “go off to infinity.” Exiting rays are the collection of ray segments nN~~cV
following the intersection point of a ray at a surface. Due to ray splitting, several (D
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ray segments may contribute to the candela data for each incident ray. Incident $ -c!W!H
rays are the collection of ray segments which intersect the selected surface. No I( S)n+E
surface selection is required for Missed rays but one is necessary for Exiting and W;1| +6x
Incident rays. FVKW9"AyW
The candela plots represent flux versus angle and can be smoothed using the ncSFj.}w]
Candela Options dialog box. The iso-candela plots can be presented as false *#TYqCc +g
color maps or contour plots. The distribution plots are graphs of cross-sectional w ~ dk#=
curves through the candela distribution. (4@lKKiU%H
The orientation of the candela plots is determined by the Normal Vector and the fi+R2p~vs
Up Vector, as specified in the Analysis|Candela Options dialog box. The NWd<+-pC6
normal vector specifies the axis of the candela plot and the up vector specifies ?X-)J=XG
“which way is up.”
