给个英文的.个人理解可能会有点出入.基本上是这个意思. I4c %>R
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric WFqOVI*l
units, a luminous intensity plot is in units of candelas (lumens per steradian). In }ASBP:c"t
radiometric units, an intensity plot is in units of watts per steradian. Candela plots K:pG<oV|}
are commonly used in the design of illumination systems, especially those used in 6skd>v UU
the far field. )oS~ish
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface _,- \;
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” y G>sBc
the model and “go off to infinity.” Exiting rays are the collection of ray segments X<1y mb3
following the intersection point of a ray at a surface. Due to ray splitting, several 0nlh0u8#
ray segments may contribute to the candela data for each incident ray. Incident =)]RD%Oq
rays are the collection of ray segments which intersect the selected surface. No -OfAl~ 4
surface selection is required for Missed rays but one is necessary for Exiting and O9{A)b!HB
Incident rays. xz,M>Ua
The candela plots represent flux versus angle and can be smoothed using the ({!*&DVu
Candela Options dialog box. The iso-candela plots can be presented as false ;:Kc{B.s
color maps or contour plots. The distribution plots are graphs of cross-sectional |:SXN4';?
curves through the candela distribution. _b=})**
The orientation of the candela plots is determined by the Normal Vector and the .3
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Up Vector, as specified in the Analysis|Candela Options dialog box. The >rh< %55P`
normal vector specifies the axis of the candela plot and the up vector specifies o` }8ZtD
“which way is up.”
