给个英文的.个人理解可能会有点出入.基本上是这个意思. iU{bPyz ,
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 9r@r\-
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ~T>_}Q[M2p
radiometric units, an intensity plot is in units of watts per steradian. Candela plots T[B@7$Dp*
are commonly used in the design of illumination systems, especially those used in -X5rGp++
the far field. ct= |y(_
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ~"!F&
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” lBh|+K N
the model and “go off to infinity.” Exiting rays are the collection of ray segments bwUsE U 0
following the intersection point of a ray at a surface. Due to ray splitting, several 7$WO@yOsh
ray segments may contribute to the candela data for each incident ray. Incident XWZ
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rays are the collection of ray segments which intersect the selected surface. No L B1 ui
surface selection is required for Missed rays but one is necessary for Exiting and Lg pj<H[
Incident rays. pbKDtqSn z
The candela plots represent flux versus angle and can be smoothed using the :X Er {X
Candela Options dialog box. The iso-candela plots can be presented as false CUfD[un2D
color maps or contour plots. The distribution plots are graphs of cross-sectional E.Xf b"]
curves through the candela distribution. zz 7 m\
The orientation of the candela plots is determined by the Normal Vector and the kX."|]
Up Vector, as specified in the Analysis|Candela Options dialog box. The JYOyz+wNd
normal vector specifies the axis of the candela plot and the up vector specifies n^'ip{
“which way is up.”
