给个英文的.个人理解可能会有点出入.基本上是这个意思. wyzBkRg.
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric * sIG&
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Oi%~8J>
radiometric units, an intensity plot is in units of watts per steradian. Candela plots q(PT'z
are commonly used in the design of illumination systems, especially those used in K"6+X|yxE
the far field. h, 6S$,UI
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface u*-<5& X
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” J gv>$u
the model and “go off to infinity.” Exiting rays are the collection of ray segments e}O -I
following the intersection point of a ray at a surface. Due to ray splitting, several m6Cd^'J9^
ray segments may contribute to the candela data for each incident ray. Incident , a_{ Y+
rays are the collection of ray segments which intersect the selected surface. No F']%q 0
surface selection is required for Missed rays but one is necessary for Exiting and c Lko
Incident rays. ^xNe Eb
The candela plots represent flux versus angle and can be smoothed using the er7/BE &
Candela Options dialog box. The iso-candela plots can be presented as false 1 > @|
color maps or contour plots. The distribution plots are graphs of cross-sectional k$x
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curves through the candela distribution. "T1#*"{j
The orientation of the candela plots is determined by the Normal Vector and the N9h@1'>
Up Vector, as specified in the Analysis|Candela Options dialog box. The *Qwhi&k
normal vector specifies the axis of the candela plot and the up vector specifies 8YLZ)k'
“which way is up.”
