给个英文的.个人理解可能会有点出入.基本上是这个意思. ;H D 4~3
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ~ 4p]E'b
units, a luminous intensity plot is in units of candelas (lumens per steradian). In _#y(w%
radiometric units, an intensity plot is in units of watts per steradian. Candela plots \#IJ=+z
are commonly used in the design of illumination systems, especially those used in G! >
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the far field. BWqik_
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 1"~O"m sb
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Z QgxrZx3
the model and “go off to infinity.” Exiting rays are the collection of ray segments @ U 7#, G
following the intersection point of a ray at a surface. Due to ray splitting, several zz+M1n-;o
ray segments may contribute to the candela data for each incident ray. Incident `2Z4#$.
rays are the collection of ray segments which intersect the selected surface. No oX=*MEfX
surface selection is required for Missed rays but one is necessary for Exiting and Wme1Uid
Incident rays. wh7i
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The candela plots represent flux versus angle and can be smoothed using the dvrvp DoE.
Candela Options dialog box. The iso-candela plots can be presented as false Lv`8jSt\
color maps or contour plots. The distribution plots are graphs of cross-sectional 4jq`No_
curves through the candela distribution. %nG ~u,_2f
The orientation of the candela plots is determined by the Normal Vector and the WsK"^"Z
Up Vector, as specified in the Analysis|Candela Options dialog box. The P^uP$D
normal vector specifies the axis of the candela plot and the up vector specifies "` 8H:y
“which way is up.”
