给个英文的.个人理解可能会有点出入.基本上是这个意思. 6}dR$*=
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric y,Q5; $w8
units, a luminous intensity plot is in units of candelas (lumens per steradian). In *"{& FEV
radiometric units, an intensity plot is in units of watts per steradian. Candela plots KfY$ka[}"S
are commonly used in the design of illumination systems, especially those used in K_BPZ5 w
the far field. N{C;~'M2ce
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface KMK `F{
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” F%/ h*
the model and “go off to infinity.” Exiting rays are the collection of ray segments xN0* 8
following the intersection point of a ray at a surface. Due to ray splitting, several d"Q |I
ray segments may contribute to the candela data for each incident ray. Incident Bl; KOR
rays are the collection of ray segments which intersect the selected surface. No =zg: aTMti
surface selection is required for Missed rays but one is necessary for Exiting and 0GXO&rCG
Incident rays. jE/oA<^
The candela plots represent flux versus angle and can be smoothed using the 8im@4A +n`
Candela Options dialog box. The iso-candela plots can be presented as false 8c xai8
color maps or contour plots. The distribution plots are graphs of cross-sectional [=TCEU{"~
curves through the candela distribution. [rY T
The orientation of the candela plots is determined by the Normal Vector and the @gfDp<
Up Vector, as specified in the Analysis|Candela Options dialog box. The V5rp.~
normal vector specifies the axis of the candela plot and the up vector specifies 2k
-+^}r
“which way is up.”
