给个英文的.个人理解可能会有点出入.基本上是这个意思.
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Hv6h7-
units, a luminous intensity plot is in units of candelas (lumens per steradian). In dX(JV' 18A
radiometric units, an intensity plot is in units of watts per steradian. Candela plots j^G=9r[,
are commonly used in the design of illumination systems, especially those used in v^"\ e&XL
the far field. &raqrY|V
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface tE*BZXBlm
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ax@H^Gj@2
the model and “go off to infinity.” Exiting rays are the collection of ray segments X [Y0r
following the intersection point of a ray at a surface. Due to ray splitting, several ]n^iG7aB?
ray segments may contribute to the candela data for each incident ray. Incident y
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rays are the collection of ray segments which intersect the selected surface. No `46~j
surface selection is required for Missed rays but one is necessary for Exiting and BabaKSm}LP
Incident rays. M7# !Y=
The candela plots represent flux versus angle and can be smoothed using the \gA!)q.;
Candela Options dialog box. The iso-candela plots can be presented as false Gp%po@A&
color maps or contour plots. The distribution plots are graphs of cross-sectional wAh]C;+ {
curves through the candela distribution. }[+uHR6L
The orientation of the candela plots is determined by the Normal Vector and the ;lObqs*?>
Up Vector, as specified in the Analysis|Candela Options dialog box. The O 9ex=m `L
normal vector specifies the axis of the candela plot and the up vector specifies qS?o22
“which way is up.”
