给个英文的.个人理解可能会有点出入.基本上是这个意思. u0J+Nj9
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ;6 1m
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Xk lp6{VH9
radiometric units, an intensity plot is in units of watts per steradian. Candela plots j1>77C3
are commonly used in the design of illumination systems, especially those used in ~5wCehSb
the far field. 1*r {%6
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface .6 E7 R
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Ac.z6]p
the model and “go off to infinity.” Exiting rays are the collection of ray segments XY| -qd}A
following the intersection point of a ray at a surface. Due to ray splitting, several S @ 7A)
ray segments may contribute to the candela data for each incident ray. Incident b@f. Kd7I
rays are the collection of ray segments which intersect the selected surface. No )vS## - [_
surface selection is required for Missed rays but one is necessary for Exiting and j>s%q .
Incident rays. &fj&UB A
The candela plots represent flux versus angle and can be smoothed using the j86s[Dty
Candela Options dialog box. The iso-candela plots can be presented as false 3@}HdLmN|
color maps or contour plots. The distribution plots are graphs of cross-sectional j <+iL]b
curves through the candela distribution. U &Ay3/
The orientation of the candela plots is determined by the Normal Vector and the ^%d+nKx9nL
Up Vector, as specified in the Analysis|Candela Options dialog box. The
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normal vector specifies the axis of the candela plot and the up vector specifies d<6L&8)<
“which way is up.”
