给个英文的.个人理解可能会有点出入.基本上是这个意思. tVun h3-
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric F+Z2U/'a
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Rv vh{U;t
radiometric units, an intensity plot is in units of watts per steradian. Candela plots L!g DFZr
are commonly used in the design of illumination systems, especially those used in qbXz7s*{
the far field. u yFn}y62
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Te;gVG *
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” z5 Bi=~=#
the model and “go off to infinity.” Exiting rays are the collection of ray segments " \:ced
following the intersection point of a ray at a surface. Due to ray splitting, several h4Ia>^@
ray segments may contribute to the candela data for each incident ray. Incident =O,JAR "ug
rays are the collection of ray segments which intersect the selected surface. No Ali Rpxxd
surface selection is required for Missed rays but one is necessary for Exiting and ^/*KNnAWp
Incident rays. k5@d! }#c
The candela plots represent flux versus angle and can be smoothed using the ]M3# 3Ha"
Candela Options dialog box. The iso-candela plots can be presented as false W<NmsG})_g
color maps or contour plots. The distribution plots are graphs of cross-sectional #XI"@pD
curves through the candela distribution. O6iCZ
The orientation of the candela plots is determined by the Normal Vector and the Noh?^@T`Ov
Up Vector, as specified in the Analysis|Candela Options dialog box. The $M':&i5`,
normal vector specifies the axis of the candela plot and the up vector specifies RlsVC_H\
“which way is up.”
