给个英文的.个人理解可能会有点出入.基本上是这个意思. Q Aygr4\X^
k_P`t[YZV
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric R^1= :<)C
units, a luminous intensity plot is in units of candelas (lumens per steradian). In D1o 8Wo
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ^z[s;:-
are commonly used in the design of illumination systems, especially those used in 5Hr(9 )
the far field. <R GRv v
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface <( BA ws(X
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” &CUkR6
the model and “go off to infinity.” Exiting rays are the collection of ray segments } {K)5 k@
following the intersection point of a ray at a surface. Due to ray splitting, several <>j, Q
ray segments may contribute to the candela data for each incident ray. Incident YgM6z K~
rays are the collection of ray segments which intersect the selected surface. No wTIf#y 1=9
surface selection is required for Missed rays but one is necessary for Exiting and et9 c<'
Incident rays. D|e 6$O 5o
The candela plots represent flux versus angle and can be smoothed using the ec=4L @V*
Candela Options dialog box. The iso-candela plots can be presented as false _x UhDu %
color maps or contour plots. The distribution plots are graphs of cross-sectional JiI(?I
curves through the candela distribution. `Z%XA>
The orientation of the candela plots is determined by the Normal Vector and the X\1D[n:
Up Vector, as specified in the Analysis|Candela Options dialog box. The Z#V[ N9L
normal vector specifies the axis of the candela plot and the up vector specifies #:s'&. 6
“which way is up.”
