给个英文的.个人理解可能会有点出入.基本上是这个意思. ^f|<R8 `
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric zMGzReJ
units, a luminous intensity plot is in units of candelas (lumens per steradian). In xNX'~B^4d
radiometric units, an intensity plot is in units of watts per steradian. Candela plots fY_%33_I$
are commonly used in the design of illumination systems, especially those used in PN
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the far field. 2y kCtRe
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface DA=1KaJ .
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” <hv7s,i
the model and “go off to infinity.” Exiting rays are the collection of ray segments bS rZ{l
following the intersection point of a ray at a surface. Due to ray splitting, several "IwM:v
ray segments may contribute to the candela data for each incident ray. Incident 2-mQt_
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rays are the collection of ray segments which intersect the selected surface. No sPCM ckt
surface selection is required for Missed rays but one is necessary for Exiting and _whF^g8
Incident rays. T3 z(k
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The candela plots represent flux versus angle and can be smoothed using the J8;Okzb!L
Candela Options dialog box. The iso-candela plots can be presented as false [Oy >R
color maps or contour plots. The distribution plots are graphs of cross-sectional qq;b~ 3 kW
curves through the candela distribution. j=ihbR^]Tl
The orientation of the candela plots is determined by the Normal Vector and the 31}W6l88c
Up Vector, as specified in the Analysis|Candela Options dialog box. The /U*y w5
normal vector specifies the axis of the candela plot and the up vector specifies "={L+di:M
“which way is up.”
