给个英文的.个人理解可能会有点出入.基本上是这个意思. .5JIQWE( 6:1`lsP A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 5hs_k[q units, a luminous intensity plot is in units of candelas (lumens per steradian). In e8,_"_1:F radiometric units, an intensity plot is in units of watts per steradian. Candela plots t]c<HDCK are commonly used in the design of illumination systems, especially those used in tX*@r the far field. O[X*F2LC4 Candela data can be collected from ray sets of Missed rays, rays Exiting a surface z$ ^d_) or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 2:LUB)&i the model and “go off to infinity.” Exiting rays are the collection of ray segments BD6!, following the intersection point of a ray at a surface. Due to ray splitting, several Y A.&ap ray segments may contribute to the candela data for each incident ray. Incident ]+lT*6P* rays are the collection of ray segments which intersect the selected surface. No =D zrM% surface selection is required for Missed rays but one is necessary for Exiting and l;$F[/3a Incident rays. N$=YL
@m8 The candela plots represent flux versus angle and can be smoothed using the gI:g/ R Candela Options dialog box. The iso-candela plots can be presented as false Q0*E&;| color maps or contour plots. The distribution plots are graphs of cross-sectional g%2G=gR$?z curves through the candela distribution.
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sY?C The orientation of the candela plots is determined by the Normal Vector and the L F?/60 Up Vector, as specified in the Analysis|Candela Options dialog box. The G<Z}G8FW^ normal vector specifies the axis of the candela plot and the up vector specifies Nr4Fp`b8 “which way is up.”