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 " O$&
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ^PC\E}
units, a luminous intensity plot is in units of candelas (lumens per steradian). In va^0JfQ
radiometric units, an intensity plot is in units of watts per steradian. Candela plots @LcT-3 u
are commonly used in the design of illumination systems, especially those used in 2hy NVG&$
the far field. `
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Y xJ`-6
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” [.a;L">
the model and “go off to infinity.” Exiting rays are the collection of ray segments r
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following the intersection point of a ray at a surface. Due to ray splitting, several YwXXXh
ray segments may contribute to the candela data for each incident ray. Incident Evkt_vvf
rays are the collection of ray segments which intersect the selected surface. No K@6`-|I
surface selection is required for Missed rays but one is necessary for Exiting and t=i/xG: 5
Incident rays. `dO}L
The candela plots represent flux versus angle and can be smoothed using the ~5ubh 2{
Candela Options dialog box. The iso-candela plots can be presented as false O ^0 "
color maps or contour plots. The distribution plots are graphs of cross-sectional ;b1wk^,Hw~
curves through the candela distribution. /~*Cp9F"]
The orientation of the candela plots is determined by the Normal Vector and the S*g`d;8gV
Up Vector, as specified in the Analysis|Candela Options dialog box. The xZyeX34{M;
normal vector specifies the axis of the candela plot and the up vector specifies XC m\z9F
“which way is up.”
