给个英文的.个人理解可能会有点出入.基本上是这个意思. T%*D~=fQ'
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Cr yBwm
units, a luminous intensity plot is in units of candelas (lumens per steradian). In U26}gT)
radiometric units, an intensity plot is in units of watts per steradian. Candela plots }a(dy r`S
are commonly used in the design of illumination systems, especially those used in v_GUNRs
the far field. <*cikXS
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface dhK~O.~m
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” )oPBa
the model and “go off to infinity.” Exiting rays are the collection of ray segments hf&9uHN%7m
following the intersection point of a ray at a surface. Due to ray splitting, several iSs:oH3l
ray segments may contribute to the candela data for each incident ray. Incident U9MxI%tb
rays are the collection of ray segments which intersect the selected surface. No YNsJZnGr8#
surface selection is required for Missed rays but one is necessary for Exiting and Jij*x> K>y
Incident rays. 8VXH +5's
The candela plots represent flux versus angle and can be smoothed using the ' %o#q6O
Candela Options dialog box. The iso-candela plots can be presented as false >(t6.=
color maps or contour plots. The distribution plots are graphs of cross-sectional or}[h09qA
curves through the candela distribution. sdw(R#GE
The orientation of the candela plots is determined by the Normal Vector and the 9V*qQS5 <p
Up Vector, as specified in the Analysis|Candela Options dialog box. The m^;f(IK5
normal vector specifies the axis of the candela plot and the up vector specifies )bs cB j@
“which way is up.”
