给个英文的.个人理解可能会有点出入.基本上是这个意思. ~I ^[rP~
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 1?$ !y
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Dj&bHC5%
radiometric units, an intensity plot is in units of watts per steradian. Candela plots [?6D1b [
are commonly used in the design of illumination systems, especially those used in Z/UVKJm>:
the far field. <>/MKMq!
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 6e-h;ylS
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 0g uc0 0IN
the model and “go off to infinity.” Exiting rays are the collection of ray segments 9n AK6$/
following the intersection point of a ray at a surface. Due to ray splitting, several SJ_cwYwI$
ray segments may contribute to the candela data for each incident ray. Incident h_"/@6
rays are the collection of ray segments which intersect the selected surface. No &U H z
surface selection is required for Missed rays but one is necessary for Exiting and v7u}nx
Incident rays. Bo(l !G
The candela plots represent flux versus angle and can be smoothed using the I{ZPv"9j^
Candela Options dialog box. The iso-candela plots can be presented as false -#M~Nb I,
color maps or contour plots. The distribution plots are graphs of cross-sectional RKb3=}
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curves through the candela distribution. k3h53QTmC
The orientation of the candela plots is determined by the Normal Vector and the Dk6\p~q
Up Vector, as specified in the Analysis|Candela Options dialog box. The 0c6AQP"=V
normal vector specifies the axis of the candela plot and the up vector specifies [ +@< T)
“which way is up.”
