给个英文的.个人理解可能会有点出入.基本上是这个意思. ahA{B1M)n
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 'WQdr(
units, a luminous intensity plot is in units of candelas (lumens per steradian). In PL@~Ys0
radiometric units, an intensity plot is in units of watts per steradian. Candela plots vt.P*Z5
are commonly used in the design of illumination systems, especially those used in 9JPEj-3`g
the far field. n#BvW,6J
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface j$Nf%V 6Y
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” mQ}Gh_'ps
the model and “go off to infinity.” Exiting rays are the collection of ray segments H?tUCbw
following the intersection point of a ray at a surface. Due to ray splitting, several 1AF%-<`?s
ray segments may contribute to the candela data for each incident ray. Incident ;1 |x
rays are the collection of ray segments which intersect the selected surface. No O|I+],
surface selection is required for Missed rays but one is necessary for Exiting and Sh&iQ_vq
Incident rays. y7z( &M@
The candela plots represent flux versus angle and can be smoothed using the rVH6QQF=\
Candela Options dialog box. The iso-candela plots can be presented as false Q".g.k
color maps or contour plots. The distribution plots are graphs of cross-sectional O$qtq(Q%
curves through the candela distribution. jH>8bXQqZ
The orientation of the candela plots is determined by the Normal Vector and the H\E7o"m
Up Vector, as specified in the Analysis|Candela Options dialog box. The t0Zk-/s
normal vector specifies the axis of the candela plot and the up vector specifies 537?9
“which way is up.”