给个英文的.个人理解可能会有点出入.基本上是这个意思. 1(RRjT 9
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric <":83RCS
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 8kvA^r`
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Spin]V
are commonly used in the design of illumination systems, especially those used in IZ87Px>zL
the far field. reM~q-M~o@
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface !;P[Y"h@r
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 0A- yQzL|
the model and “go off to infinity.” Exiting rays are the collection of ray segments l/"!}wF
following the intersection point of a ray at a surface. Due to ray splitting, several <4 ~ SFTWY
ray segments may contribute to the candela data for each incident ray. Incident ei"c|/pO
rays are the collection of ray segments which intersect the selected surface. No {u -J?(s}
surface selection is required for Missed rays but one is necessary for Exiting and Cl3L)
Incident rays. ,~DKU*A_~
The candela plots represent flux versus angle and can be smoothed using the _~*j=XR s
Candela Options dialog box. The iso-candela plots can be presented as false RCoDdtMo
color maps or contour plots. The distribution plots are graphs of cross-sectional $yq76
curves through the candela distribution. d1D=R8 P_u
The orientation of the candela plots is determined by the Normal Vector and the ZkO2*;
Up Vector, as specified in the Analysis|Candela Options dialog box. The f2 &6NC;
normal vector specifies the axis of the candela plot and the up vector specifies R%q:].
“which way is up.”
