给个英文的.个人理解可能会有点出入.基本上是这个意思. u.X]K:Yow
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Eu(Qe ST\
units, a luminous intensity plot is in units of candelas (lumens per steradian). In . J O3#
radiometric units, an intensity plot is in units of watts per steradian. Candela plots md+pS"8o;
are commonly used in the design of illumination systems, especially those used in }jC O@v;
the far field. t/ Io.d
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ZMg suzg
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Zo&i0%S\E
the model and “go off to infinity.” Exiting rays are the collection of ray segments Y
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following the intersection point of a ray at a surface. Due to ray splitting, several /io06)-/n
ray segments may contribute to the candela data for each incident ray. Incident ,:(s=J N+
rays are the collection of ray segments which intersect the selected surface. No {UP[iw$~
surface selection is required for Missed rays but one is necessary for Exiting and Qpmq@iL
Incident rays. (7G4 v
The candela plots represent flux versus angle and can be smoothed using the A| f6H6UUx
Candela Options dialog box. The iso-candela plots can be presented as false )]C]K B
color maps or contour plots. The distribution plots are graphs of cross-sectional "ZGP,=?y2
curves through the candela distribution. Li5&^RAo|J
The orientation of the candela plots is determined by the Normal Vector and the WBWW7 HK
Up Vector, as specified in the Analysis|Candela Options dialog box. The n o<$=(11i
normal vector specifies the axis of the candela plot and the up vector specifies n5d8^c! 2
“which way is up.”
