给个英文的.个人理解可能会有点出入.基本上是这个意思. HZC^Q7]hy
5H#f;L\k
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric NovF?kh2
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ,Bax0p
radiometric units, an intensity plot is in units of watts per steradian. Candela plots =aZgq99
are commonly used in the design of illumination systems, especially those used in U o?g@D
the far field. _ K["qm{X_
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface VWf&F`^B(
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” <y[LdB/a
the model and “go off to infinity.” Exiting rays are the collection of ray segments w%F~4|F
following the intersection point of a ray at a surface. Due to ray splitting, several S?ELFq(g
ray segments may contribute to the candela data for each incident ray. Incident T tTp ,If
rays are the collection of ray segments which intersect the selected surface. No .Qk T-12
surface selection is required for Missed rays but one is necessary for Exiting and ci*rem
Incident rays. x 6Zhw9RV
The candela plots represent flux versus angle and can be smoothed using the EYWRTh
Candela Options dialog box. The iso-candela plots can be presented as false t4(Z@X$
color maps or contour plots. The distribution plots are graphs of cross-sectional OQ>8Q`
curves through the candela distribution. 8AL`<8$
The orientation of the candela plots is determined by the Normal Vector and the [w*YH5kX
Up Vector, as specified in the Analysis|Candela Options dialog box. The mU@pRjq=
normal vector specifies the axis of the candela plot and the up vector specifies _wMx KM
“which way is up.”
