给个英文的.个人理解可能会有点出入.基本上是这个意思. \bT0\
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric =7e!'cF[
units, a luminous intensity plot is in units of candelas (lumens per steradian). In kk`K;`[tB
radiometric units, an intensity plot is in units of watts per steradian. Candela plots _LZ(HTX~
are commonly used in the design of illumination systems, especially those used in OB9E30
the far field. q`mxN!1[
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface &iWTf K7
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” `^/8dIya
the model and “go off to infinity.” Exiting rays are the collection of ray segments .'o=J`|
following the intersection point of a ray at a surface. Due to ray splitting, several !4Zy$6 9R
ray segments may contribute to the candela data for each incident ray. Incident -
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rays are the collection of ray segments which intersect the selected surface. No +pgHCzwJE
surface selection is required for Missed rays but one is necessary for Exiting and h._eP.W `
Incident rays. 2p9^ =
The candela plots represent flux versus angle and can be smoothed using the 'AK '(cZ
Candela Options dialog box. The iso-candela plots can be presented as false Gjeb)Y6N
color maps or contour plots. The distribution plots are graphs of cross-sectional =c \(]xX
curves through the candela distribution. \},H\kK+^
The orientation of the candela plots is determined by the Normal Vector and the .aO6Y+Y
Up Vector, as specified in the Analysis|Candela Options dialog box. The ^ U,iDK_
normal vector specifies the axis of the candela plot and the up vector specifies jY\z+lW6A
“which way is up.”
