给个英文的.个人理解可能会有点出入.基本上是这个意思. ia 73?*mXT
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric t<viX's
units, a luminous intensity plot is in units of candelas (lumens per steradian). In nj53G67y
radiometric units, an intensity plot is in units of watts per steradian. Candela plots I
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are commonly used in the design of illumination systems, especially those used in I.k
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the far field. C73 kJa
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface &9)\wnOS
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” |H+Wed|
the model and “go off to infinity.” Exiting rays are the collection of ray segments %|i`kYsy
following the intersection point of a ray at a surface. Due to ray splitting, several :[!j?)%>
ray segments may contribute to the candela data for each incident ray. Incident N* &1GT#9
rays are the collection of ray segments which intersect the selected surface. No
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surface selection is required for Missed rays but one is necessary for Exiting and 'X2PO ay1
Incident rays. w*JGUk
The candela plots represent flux versus angle and can be smoothed using the *=7U4W
Candela Options dialog box. The iso-candela plots can be presented as false /~f'}]W
color maps or contour plots. The distribution plots are graphs of cross-sectional /gk X 38
curves through the candela distribution. 3kMf!VL
The orientation of the candela plots is determined by the Normal Vector and the 3jC_AO %T
Up Vector, as specified in the Analysis|Candela Options dialog box. The .h4 \Y A
normal vector specifies the axis of the candela plot and the up vector specifies w
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“which way is up.”
