给个英文的.个人理解可能会有点出入.基本上是这个意思. 's!-80sd
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric =AEz9d ciS
units, a luminous intensity plot is in units of candelas (lumens per steradian). In rf 9 _eP
radiometric units, an intensity plot is in units of watts per steradian. Candela plots @C-dG7U.P
are commonly used in the design of illumination systems, especially those used in rJ'I>Q~x6
the far field. )g@S%Yu
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 5;TuVU.8Q
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” geefnb
the model and “go off to infinity.” Exiting rays are the collection of ray segments p(m1O70 C
following the intersection point of a ray at a surface. Due to ray splitting, several _0 snAt^iC
ray segments may contribute to the candela data for each incident ray. Incident hc$@J}`
rays are the collection of ray segments which intersect the selected surface. No aSYs_?&.
surface selection is required for Missed rays but one is necessary for Exiting and i_LF`JhEQT
Incident rays. 9kY[j2,+
The candela plots represent flux versus angle and can be smoothed using the LDy<k=;o
Candela Options dialog box. The iso-candela plots can be presented as false 68'>Zbelb
color maps or contour plots. The distribution plots are graphs of cross-sectional DV]7.Bm
curves through the candela distribution. + f;CyMEp
The orientation of the candela plots is determined by the Normal Vector and the HT_TP q
Up Vector, as specified in the Analysis|Candela Options dialog box. The N(3R |Ii
normal vector specifies the axis of the candela plot and the up vector specifies Ei @M$Fd
“which way is up.”
