给个英文的.个人理解可能会有点出入.基本上是这个意思. aFX=C >M
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric S6 Q
units, a luminous intensity plot is in units of candelas (lumens per steradian). In e5ZX
radiometric units, an intensity plot is in units of watts per steradian. Candela plots JzQ_{J`k
are commonly used in the design of illumination systems, especially those used in oM>l#><nq
the far field. X:"i4i[}{9
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface n,y ZRY
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 4 #Mt F'J
the model and “go off to infinity.” Exiting rays are the collection of ray segments ^,TO#%$iE
following the intersection point of a ray at a surface. Due to ray splitting, several G:<aB
ray segments may contribute to the candela data for each incident ray. Incident -V77C^()8d
rays are the collection of ray segments which intersect the selected surface. No $Vg>I>i
surface selection is required for Missed rays but one is necessary for Exiting and >C>.\
Incident rays. NZ:,ph
The candela plots represent flux versus angle and can be smoothed using the =7=]{Cx[
Candela Options dialog box. The iso-candela plots can be presented as false pK>N-/?a
color maps or contour plots. The distribution plots are graphs of cross-sectional {BN#h[#B{
curves through the candela distribution. t\ dN DS
The orientation of the candela plots is determined by the Normal Vector and the @Md/Q~>
Up Vector, as specified in the Analysis|Candela Options dialog box. The TQF| a\M'
normal vector specifies the axis of the candela plot and the up vector specifies O m|_{
“which way is up.”
