给个英文的.个人理解可能会有点出入.基本上是这个意思. P c&dU1
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric <V}q8k
units, a luminous intensity plot is in units of candelas (lumens per steradian). In b00$3,L
radiometric units, an intensity plot is in units of watts per steradian. Candela plots zOA~<fhT
are commonly used in the design of illumination systems, especially those used in %CYo,
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the far field. D 1+1j:m
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface @i> r(X
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 1P"{TMd?
the model and “go off to infinity.” Exiting rays are the collection of ray segments $DfK}C T
following the intersection point of a ray at a surface. Due to ray splitting, several FZ %h7Oe
ray segments may contribute to the candela data for each incident ray. Incident &Jb$YKt
rays are the collection of ray segments which intersect the selected surface. No 8m mnnf{P
surface selection is required for Missed rays but one is necessary for Exiting and j;48Yya'
Incident rays. Rs{8vV
The candela plots represent flux versus angle and can be smoothed using the E@otV6Wk[@
Candela Options dialog box. The iso-candela plots can be presented as false S Im1fC
color maps or contour plots. The distribution plots are graphs of cross-sectional A@_>9;
curves through the candela distribution. F{QOu0$cA4
The orientation of the candela plots is determined by the Normal Vector and the ?fP3R':s
Up Vector, as specified in the Analysis|Candela Options dialog box. The
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normal vector specifies the axis of the candela plot and the up vector specifies 'h WA&Xx +
“which way is up.”
