给个英文的.个人理解可能会有点出入.基本上是这个意思. "Q( 8FF
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric gQ[4{+DSf
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ,>Q,0bVhH0
radiometric units, an intensity plot is in units of watts per steradian. Candela plots l)H u.1~
are commonly used in the design of illumination systems, especially those used in l`k3!EZDS
the far field. //(c 1/s
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface (~#9KA1A}
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” G(-
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the model and “go off to infinity.” Exiting rays are the collection of ray segments \[BnAgsF
following the intersection point of a ray at a surface. Due to ray splitting, several %A Fy{l
ray segments may contribute to the candela data for each incident ray. Incident a)e2WgVB/E
rays are the collection of ray segments which intersect the selected surface. No s QkP@Y
surface selection is required for Missed rays but one is necessary for Exiting and U"Y$7~
Incident rays. T r8+E;;
The candela plots represent flux versus angle and can be smoothed using the Ni`qU(I'|
Candela Options dialog box. The iso-candela plots can be presented as false '"&?u8u)
color maps or contour plots. The distribution plots are graphs of cross-sectional b#F3,T__`Y
curves through the candela distribution. ?$ ?Ni)Z
The orientation of the candela plots is determined by the Normal Vector and the 3 f 3?%9
Up Vector, as specified in the Analysis|Candela Options dialog box. The 9M6&+1XE
normal vector specifies the axis of the candela plot and the up vector specifies _Cs.%R!r
“which way is up.”
