给个英文的.个人理解可能会有点出入.基本上是这个意思. (G/(w%#7_
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric q#SEtyJL
units, a luminous intensity plot is in units of candelas (lumens per steradian). In P ]TT8Jgw
radiometric units, an intensity plot is in units of watts per steradian. Candela plots A7,%'.k
are commonly used in the design of illumination systems, especially those used in B"zB =A w
the far field. ,i Y:#E
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface bt(Y@3;
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ^B%c3U$o
the model and “go off to infinity.” Exiting rays are the collection of ray segments CyS %1 1L
following the intersection point of a ray at a surface. Due to ray splitting, several c*]f#yr?
ray segments may contribute to the candela data for each incident ray. Incident 1)jea wVmj
rays are the collection of ray segments which intersect the selected surface. No %-$BtR2@o
surface selection is required for Missed rays but one is necessary for Exiting and i]J.WFu
Incident rays. ^G2M4+W|
The candela plots represent flux versus angle and can be smoothed using the _C (fz CK
Candela Options dialog box. The iso-candela plots can be presented as false CBF<53TshR
color maps or contour plots. The distribution plots are graphs of cross-sectional *8uS,s6g
curves through the candela distribution. N / '
The orientation of the candela plots is determined by the Normal Vector and the znSlSQpTv
Up Vector, as specified in the Analysis|Candela Options dialog box. The p2k`)=iX
normal vector specifies the axis of the candela plot and the up vector specifies em5~4;&'
“which way is up.”
