给个英文的.个人理解可能会有点出入.基本上是这个意思. ol<lCp
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric v&r=-}z2!
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ` .[ 8$
radiometric units, an intensity plot is in units of watts per steradian. Candela plots
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are commonly used in the design of illumination systems, especially those used in uOre,AQR
the far field. I-bF{
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 1AT'S;`
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” -;U3w.-
the model and “go off to infinity.” Exiting rays are the collection of ray segments 5uttv:@=
following the intersection point of a ray at a surface. Due to ray splitting, several _Z.cMYN
ray segments may contribute to the candela data for each incident ray. Incident ;iQp7aW{$
rays are the collection of ray segments which intersect the selected surface. No '#<> "|
surface selection is required for Missed rays but one is necessary for Exiting and ; y OD
Incident rays. ;NP[_2|-,
The candela plots represent flux versus angle and can be smoothed using the y?Onb 3%
Candela Options dialog box. The iso-candela plots can be presented as false : ~D]; m
color maps or contour plots. The distribution plots are graphs of cross-sectional ABZ06S/
curves through the candela distribution. Hd374U<8]T
The orientation of the candela plots is determined by the Normal Vector and the rREzM)GA
Up Vector, as specified in the Analysis|Candela Options dialog box. The cQn)^jx=
normal vector specifies the axis of the candela plot and the up vector specifies R 6<4"?*r
“which way is up.”
