给个英文的.个人理解可能会有点出入.基本上是这个意思. /ZM
xVh0
@6Lp $w
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric >I-rsw2
units, a luminous intensity plot is in units of candelas (lumens per steradian). In <Mu T7x-
radiometric units, an intensity plot is in units of watts per steradian. Candela plots KyQTrl.qdl
are commonly used in the design of illumination systems, especially those used in fg lN _
the far field. * 3]2vq
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface zeq")A
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” =k,?+h~
the model and “go off to infinity.” Exiting rays are the collection of ray segments E ;9J7Q
4
following the intersection point of a ray at a surface. Due to ray splitting, several X{(?p=]
ray segments may contribute to the candela data for each incident ray. Incident =M}tet
}
rays are the collection of ray segments which intersect the selected surface. No n^b CrvD
surface selection is required for Missed rays but one is necessary for Exiting and !X||ds
Incident rays. 'nq~ 1 >i
The candela plots represent flux versus angle and can be smoothed using the y^[t3XA6Q
Candela Options dialog box. The iso-candela plots can be presented as false IG7,- 3
color maps or contour plots. The distribution plots are graphs of cross-sectional vxug>2
curves through the candela distribution. -ssmj8:Q\|
The orientation of the candela plots is determined by the Normal Vector and the mkfDDl2 GP
Up Vector, as specified in the Analysis|Candela Options dialog box. The X&h?1lMJ /
normal vector specifies the axis of the candela plot and the up vector specifies T 1R~^x1
“which way is up.”
