给个英文的.个人理解可能会有点出入.基本上是这个意思. 9]l yV
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric +\u\BJ!LAJ
units, a luminous intensity plot is in units of candelas (lumens per steradian). In FQE(qltf,
radiometric units, an intensity plot is in units of watts per steradian. Candela plots pSEaE9AX%
are commonly used in the design of illumination systems, especially those used in Y Xh!+}
the far field. ,rF!o_7
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 9'e<{mlM
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” C N}0( 2n
the model and “go off to infinity.” Exiting rays are the collection of ray segments p: eaZ
following the intersection point of a ray at a surface. Due to ray splitting, several Y"^. 6
ray segments may contribute to the candela data for each incident ray. Incident g:!R't?
rays are the collection of ray segments which intersect the selected surface. No TJ>1?W\Z
surface selection is required for Missed rays but one is necessary for Exiting and rx@i .+
Incident rays. a;nYR5f
The candela plots represent flux versus angle and can be smoothed using the |5&7 ;;$
Candela Options dialog box. The iso-candela plots can be presented as false XW\
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color maps or contour plots. The distribution plots are graphs of cross-sectional k7L4~W
curves through the candela distribution. ,H<nNBv 3M
The orientation of the candela plots is determined by the Normal Vector and the 3`RI[% AN~
Up Vector, as specified in the Analysis|Candela Options dialog box. The ~O!E &~
normal vector specifies the axis of the candela plot and the up vector specifies W7@Vm a`
“which way is up.”
