给个英文的.个人理解可能会有点出入.基本上是这个意思. $2>" 2*,04
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric /2x@Z>
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ]T;
radiometric units, an intensity plot is in units of watts per steradian. Candela plots #By~gcN
are commonly used in the design of illumination systems, especially those used in sEHA?UP$<F
the far field. 4XgzNwm
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface |.?X ov]
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” #A 7|=E
the model and “go off to infinity.” Exiting rays are the collection of ray segments =3EE- %eF!
following the intersection point of a ray at a surface. Due to ray splitting, several "Ky&x$dje
ray segments may contribute to the candela data for each incident ray. Incident &l~9FE *
rays are the collection of ray segments which intersect the selected surface. No rAZ~R PrW
surface selection is required for Missed rays but one is necessary for Exiting and PB;j4
Incident rays. T_ga?G<
The candela plots represent flux versus angle and can be smoothed using the mCSt.n~
Candela Options dialog box. The iso-candela plots can be presented as false "V <WC"
color maps or contour plots. The distribution plots are graphs of cross-sectional f>[{1M]n\
curves through the candela distribution. ?D+H2[n\a
The orientation of the candela plots is determined by the Normal Vector and the 8<=]4- X@
Up Vector, as specified in the Analysis|Candela Options dialog box. The nP+jkNn3
normal vector specifies the axis of the candela plot and the up vector specifies UG=],\E2
“which way is up.”
