给个英文的.个人理解可能会有点出入.基本上是这个意思. LqZsH0C
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric +4*3aWf`
units, a luminous intensity plot is in units of candelas (lumens per steradian). In i[IOR 0
radiometric units, an intensity plot is in units of watts per steradian. Candela plots hDn?R}^l{
are commonly used in the design of illumination systems, especially those used in \LN! k-c
the far field. _l{`lQ}
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface & U.U<
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ?R P&XrD
the model and “go off to infinity.” Exiting rays are the collection of ray segments pXoD*o b
following the intersection point of a ray at a surface. Due to ray splitting, several 4r+@7hnK
ray segments may contribute to the candela data for each incident ray. Incident b.N$eJl Q&
rays are the collection of ray segments which intersect the selected surface. No 3qlY=5Y
surface selection is required for Missed rays but one is necessary for Exiting and lG1\41ZxB
Incident rays. Z,jR:_ p
The candela plots represent flux versus angle and can be smoothed using the _~QiQDq
Candela Options dialog box. The iso-candela plots can be presented as false xWiR7~E
color maps or contour plots. The distribution plots are graphs of cross-sectional wr) \GJ#>
curves through the candela distribution. V*Q!J{lj^#
The orientation of the candela plots is determined by the Normal Vector and the ++gWyzD
Up Vector, as specified in the Analysis|Candela Options dialog box. The Rj'Tu0l
normal vector specifies the axis of the candela plot and the up vector specifies M ^89]wo C
“which way is up.”
