给个英文的.个人理解可能会有点出入.基本上是这个意思. L^Af3]]2
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 7~g0{W>Zm
units, a luminous intensity plot is in units of candelas (lumens per steradian). In x@x@0k`A2
radiometric units, an intensity plot is in units of watts per steradian. Candela plots t)ry)[Dxv
are commonly used in the design of illumination systems, especially those used in r F - yD1
the far field. {=Y&q~:8v
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ;<Q_4
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” G]4+ Qr?
the model and “go off to infinity.” Exiting rays are the collection of ray segments U%olH >1K
following the intersection point of a ray at a surface. Due to ray splitting, several :"^ $ 7
ray segments may contribute to the candela data for each incident ray. Incident 7~f l4*
rays are the collection of ray segments which intersect the selected surface. No Fs~-exY1
surface selection is required for Missed rays but one is necessary for Exiting and >.A:6
Incident rays. d":{a6D*d
The candela plots represent flux versus angle and can be smoothed using the 3Pq)RD|hn
Candela Options dialog box. The iso-candela plots can be presented as false s!\L1E
color maps or contour plots. The distribution plots are graphs of cross-sectional ;W"[,#2TM
curves through the candela distribution. (/Bkwb JyE
The orientation of the candela plots is determined by the Normal Vector and the {hR23eE)#
Up Vector, as specified in the Analysis|Candela Options dialog box. The UJ&,9}L8
normal vector specifies the axis of the candela plot and the up vector specifies
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“which way is up.”
