给个英文的.个人理解可能会有点出入.基本上是这个意思. 1<x5{/CZ
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric CPa+?__B
units, a luminous intensity plot is in units of candelas (lumens per steradian). In mu0L_u(P
radiometric units, an intensity plot is in units of watts per steradian. Candela plots >7a
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are commonly used in the design of illumination systems, especially those used in < EyJ $$
the far field. ShRMzU
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface XKp( 31])
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” mK M[[l&A
the model and “go off to infinity.” Exiting rays are the collection of ray segments 9J%O$sF
following the intersection point of a ray at a surface. Due to ray splitting, several ? }^ y6
ray segments may contribute to the candela data for each incident ray. Incident >*/
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rays are the collection of ray segments which intersect the selected surface. No Sy.%>$ z
surface selection is required for Missed rays but one is necessary for Exiting and d+P<ce2 G
Incident rays. U'b}%[
The candela plots represent flux versus angle and can be smoothed using the n "iaE
Candela Options dialog box. The iso-candela plots can be presented as false SN[ yC
color maps or contour plots. The distribution plots are graphs of cross-sectional m q<:^
curves through the candela distribution. ZyU / .Uk
The orientation of the candela plots is determined by the Normal Vector and the +Rd\*b
Up Vector, as specified in the Analysis|Candela Options dialog box. The LVP6 vs
normal vector specifies the axis of the candela plot and the up vector specifies * >iJ=H
“which way is up.”
