给个英文的.个人理解可能会有点出入.基本上是这个意思. ! %S9H2Lv
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Vrf2%$g
units, a luminous intensity plot is in units of candelas (lumens per steradian). In vHZw{'5y
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 5][ Rvu0
are commonly used in the design of illumination systems, especially those used in ^VR1whCrx
the far field. :=+s^K
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface f \!*%xS;
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” i%GjtYjS
the model and “go off to infinity.” Exiting rays are the collection of ray segments 2fT't"gw
following the intersection point of a ray at a surface. Due to ray splitting, several U
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ray segments may contribute to the candela data for each incident ray. Incident /XjIm4EN
rays are the collection of ray segments which intersect the selected surface. No 7]_UZ)u
surface selection is required for Missed rays but one is necessary for Exiting and |xG| HJm,
Incident rays. `o8b\p\zn
The candela plots represent flux versus angle and can be smoothed using the kzZtKN9Az
Candela Options dialog box. The iso-candela plots can be presented as false h
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color maps or contour plots. The distribution plots are graphs of cross-sectional !u.{<51b
curves through the candela distribution. Hv>A$x$q
The orientation of the candela plots is determined by the Normal Vector and the hV;Tm7I2
Up Vector, as specified in the Analysis|Candela Options dialog box. The "!i7U2M'
normal vector specifies the axis of the candela plot and the up vector specifies p#HPWW"
“which way is up.”
