给个英文的.个人理解可能会有点出入.基本上是这个意思. zFz10pH
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric X] % itA
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 8C bX MT
radiometric units, an intensity plot is in units of watts per steradian. Candela plots nUS| sh
are commonly used in the design of illumination systems, especially those used in zK|i='XSf
the far field. _8 ,()t'"
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface -I.d}[
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” A@hppaP!
the model and “go off to infinity.” Exiting rays are the collection of ray segments ag-f{UsTy
following the intersection point of a ray at a surface. Due to ray splitting, several @$9'@" )
ray segments may contribute to the candela data for each incident ray. Incident T*g:#
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rays are the collection of ray segments which intersect the selected surface. No HpZ1xT
surface selection is required for Missed rays but one is necessary for Exiting and Zf$Np50@(
Incident rays. ~6YMD
The candela plots represent flux versus angle and can be smoothed using the br -]fE.be
Candela Options dialog box. The iso-candela plots can be presented as false >P6BW
color maps or contour plots. The distribution plots are graphs of cross-sectional Xpe)PXb
curves through the candela distribution. fGhn+8VfX
The orientation of the candela plots is determined by the Normal Vector and the %yB B?cp+_
Up Vector, as specified in the Analysis|Candela Options dialog box. The vM:cWat
normal vector specifies the axis of the candela plot and the up vector specifies 3?2 FP|G8
“which way is up.”
