给个英文的.个人理解可能会有点出入.基本上是这个意思. kZNZ?A <D
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric x7?{*w&r
units, a luminous intensity plot is in units of candelas (lumens per steradian). In sh1()vT
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 8h97~$7)
are commonly used in the design of illumination systems, especially those used in -E7\ .K3
the far field. ~7
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface }Urt DXhA
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” '\Ub*m((1O
the model and “go off to infinity.” Exiting rays are the collection of ray segments /v[- KjTj7
following the intersection point of a ray at a surface. Due to ray splitting, several rL=$Wxd PU
ray segments may contribute to the candela data for each incident ray. Incident ?x @khzk
rays are the collection of ray segments which intersect the selected surface. No 6_K z}PQ
surface selection is required for Missed rays but one is necessary for Exiting and OBZj-`fq J
Incident rays. ( EX
The candela plots represent flux versus angle and can be smoothed using the '<Gqu_-
Candela Options dialog box. The iso-candela plots can be presented as false %0 4n,&mg
color maps or contour plots. The distribution plots are graphs of cross-sectional jo ^*R'}
curves through the candela distribution. he Wb(E&
The orientation of the candela plots is determined by the Normal Vector and the y^Lw7
Up Vector, as specified in the Analysis|Candela Options dialog box. The XHr{\/4V
normal vector specifies the axis of the candela plot and the up vector specifies o2~x '*A0I
“which way is up.”
