给个英文的.个人理解可能会有点出入.基本上是这个意思. BO7XN;
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric t&NpC;>v
units, a luminous intensity plot is in units of candelas (lumens per steradian). In B?yj U[/R
radiometric units, an intensity plot is in units of watts per steradian. Candela plots C| 2|OTtQ
are commonly used in the design of illumination systems, especially those used in z"mpw mv5
the far field. fFYoZ/\
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface C/H; |3. X
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” z&Aya*0v`
the model and “go off to infinity.” Exiting rays are the collection of ray segments fms(_Q:R?
following the intersection point of a ray at a surface. Due to ray splitting, several C J7S5
ray segments may contribute to the candela data for each incident ray. Incident ly35n`
rays are the collection of ray segments which intersect the selected surface. No r ;MFVj{
surface selection is required for Missed rays but one is necessary for Exiting and t72rCq QC
Incident rays. [~X&J#
The candela plots represent flux versus angle and can be smoothed using the $4~Z]-38#A
Candela Options dialog box. The iso-candela plots can be presented as false ^\kH^
color maps or contour plots. The distribution plots are graphs of cross-sectional $d !Vx m
curves through the candela distribution. >\3\&[#"
The orientation of the candela plots is determined by the Normal Vector and the a s('ZD.9
Up Vector, as specified in the Analysis|Candela Options dialog box. The uubIL +
normal vector specifies the axis of the candela plot and the up vector specifies 8ZqLG a]
“which way is up.”
