给个英文的.个人理解可能会有点出入.基本上是这个意思. (Zu V5|N
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric U*em)/9
units, a luminous intensity plot is in units of candelas (lumens per steradian). In u +uu?.bM
radiometric units, an intensity plot is in units of watts per steradian. Candela plots YiPp#0T[Gx
are commonly used in the design of illumination systems, especially those used in <(-4?"1
the far field. Bn{0-5nj
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface BXo9s~ 5Q
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” &b&o];a
the model and “go off to infinity.” Exiting rays are the collection of ray segments S~ 3|
following the intersection point of a ray at a surface. Due to ray splitting, several ,@*`2I>`
ray segments may contribute to the candela data for each incident ray. Incident t9
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rays are the collection of ray segments which intersect the selected surface. No U9p^?\-=
surface selection is required for Missed rays but one is necessary for Exiting and hKW!kA =gZ
Incident rays. @Ao E>
The candela plots represent flux versus angle and can be smoothed using the I Ux svW+
Candela Options dialog box. The iso-candela plots can be presented as false 4i o02qd
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color maps or contour plots. The distribution plots are graphs of cross-sectional H@WQO]P A
curves through the candela distribution. Dbo. N`
The orientation of the candela plots is determined by the Normal Vector and the S=~8nr/V
Up Vector, as specified in the Analysis|Candela Options dialog box. The CDM==Xa*
normal vector specifies the axis of the candela plot and the up vector specifies ;]^JUmxU[d
“which way is up.”
