给个英文的.个人理解可能会有点出入.基本上是这个意思. EI >l-N2
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 'wasZ b<^
units, a luminous intensity plot is in units of candelas (lumens per steradian). In /wShUR{
radiometric units, an intensity plot is in units of watts per steradian. Candela plots .R* !aK
are commonly used in the design of illumination systems, especially those used in pW0dB_
the far field. /&#XhrT
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 1+;C`bnA
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” _Q%vK*n
the model and “go off to infinity.” Exiting rays are the collection of ray segments 8F(h*e_?
following the intersection point of a ray at a surface. Due to ray splitting, several }kHd K vZ
ray segments may contribute to the candela data for each incident ray. Incident J q.lT(E8D
rays are the collection of ray segments which intersect the selected surface. No w>fdQ!RdP
surface selection is required for Missed rays but one is necessary for Exiting and -Y#sI3o*R8
Incident rays. 4BYE1fUzd
The candela plots represent flux versus angle and can be smoothed using the s.Y4pWd5@
Candela Options dialog box. The iso-candela plots can be presented as false TcTM]ixr
color maps or contour plots. The distribution plots are graphs of cross-sectional Cb t{ H}I3
curves through the candela distribution. )4U> !KrY
The orientation of the candela plots is determined by the Normal Vector and the WF&[HKOy/
Up Vector, as specified in the Analysis|Candela Options dialog box. The RgdysyB
normal vector specifies the axis of the candela plot and the up vector specifies -$VZte x
“which way is up.”
