给个英文的.个人理解可能会有点出入.基本上是这个意思. >uSy
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric zzxGAVu
units, a luminous intensity plot is in units of candelas (lumens per steradian). In t25,0<iW
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 3g >B"t
are commonly used in the design of illumination systems, especially those used in &uO%_6J
the far field. 9]@A]p!
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface o93`|yWl
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 1R,:
the model and “go off to infinity.” Exiting rays are the collection of ray segments DCZ\6WY1G)
following the intersection point of a ray at a surface. Due to ray splitting, several r wI
ray segments may contribute to the candela data for each incident ray. Incident 8?%-'z.
rays are the collection of ray segments which intersect the selected surface. No RO.k]x6
surface selection is required for Missed rays but one is necessary for Exiting and ll C#1
Incident rays. >"C,@cN}B
The candela plots represent flux versus angle and can be smoothed using the Ry'= ke
Candela Options dialog box. The iso-candela plots can be presented as false #W|'1
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color maps or contour plots. The distribution plots are graphs of cross-sectional .,OVz W
curves through the candela distribution. [<6S%s
The orientation of the candela plots is determined by the Normal Vector and the Z-l =\ekJ
Up Vector, as specified in the Analysis|Candela Options dialog box. The v#!%GEg1r
normal vector specifies the axis of the candela plot and the up vector specifies ?#45w C
“which way is up.”
