给个英文的.个人理解可能会有点出入.基本上是这个意思. MLbmz\8a
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric }@Ap_xW
units, a luminous intensity plot is in units of candelas (lumens per steradian). In C`4 m#
radiometric units, an intensity plot is in units of watts per steradian. Candela plots WO w( -
are commonly used in the design of illumination systems, especially those used in fi |k)
the far field. >iZ"#1ZL2O
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface =tP%K*Il4
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” : eL{&& 6
the model and “go off to infinity.” Exiting rays are the collection of ray segments T BAF_$
following the intersection point of a ray at a surface. Due to ray splitting, several L5 -p0O`R
ray segments may contribute to the candela data for each incident ray. Incident M>eMDCB\
rays are the collection of ray segments which intersect the selected surface. No <_o).hE{
surface selection is required for Missed rays but one is necessary for Exiting and sbeS9vE
Incident rays. >-%tvrS%
The candela plots represent flux versus angle and can be smoothed using the 2.,4b- ^
Candela Options dialog box. The iso-candela plots can be presented as false A_:CGtv:
color maps or contour plots. The distribution plots are graphs of cross-sectional M j9Mv<io
curves through the candela distribution. 3} Xf
The orientation of the candela plots is determined by the Normal Vector and the & xAwk-{W
Up Vector, as specified in the Analysis|Candela Options dialog box. The F'~\!dNL
normal vector specifies the axis of the candela plot and the up vector specifies [:CV5k~xc
“which way is up.”
