给个英文的.个人理解可能会有点出入.基本上是这个意思. rFRcK>X\L
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric .DCHc,DxA
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 9%!h/m>rW
radiometric units, an intensity plot is in units of watts per steradian. Candela plots xY^sC56Z
are commonly used in the design of illumination systems, especially those used in ?[D 3 -4
the far field. m>@hh#kBg
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface I{Zb/}k-
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” <n2@;` D
the model and “go off to infinity.” Exiting rays are the collection of ray segments u6qK4*eAD
following the intersection point of a ray at a surface. Due to ray splitting, several !# tVQ2O
ray segments may contribute to the candela data for each incident ray. Incident Q]:O#;"<
rays are the collection of ray segments which intersect the selected surface. No jEc_!Q
surface selection is required for Missed rays but one is necessary for Exiting and D'"
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Incident rays. |3*9+4]a
The candela plots represent flux versus angle and can be smoothed using the IGdiIhH~2
Candela Options dialog box. The iso-candela plots can be presented as false n
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color maps or contour plots. The distribution plots are graphs of cross-sectional 1K72}Gj)ZL
curves through the candela distribution. C"{^wy{sL
The orientation of the candela plots is determined by the Normal Vector and the #@XBHJD\#
Up Vector, as specified in the Analysis|Candela Options dialog box. The p=8 Qv
normal vector specifies the axis of the candela plot and the up vector specifies 1|bXIY.J*
“which way is up.”
