给个英文的.个人理解可能会有点出入.基本上是这个意思. >k@{NP2b
7^ U s
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric rfQs
7S;G
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ,K6ODtw.
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Zn. S65J*u
are commonly used in the design of illumination systems, especially those used in NcwUK \
the far field. 2,B^OZ mw
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface pp*MHM)x|q
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Yz0HB EA
the model and “go off to infinity.” Exiting rays are the collection of ray segments o](O RS$~
following the intersection point of a ray at a surface. Due to ray splitting, several :4X,5X7tW=
ray segments may contribute to the candela data for each incident ray. Incident ^mI`P}5Y
rays are the collection of ray segments which intersect the selected surface. No @q]!C5
surface selection is required for Missed rays but one is necessary for Exiting and uQW[2f
Incident rays. #=Xa(<t
The candela plots represent flux versus angle and can be smoothed using the :mCGY9d4L
Candela Options dialog box. The iso-candela plots can be presented as false wod{C !
color maps or contour plots. The distribution plots are graphs of cross-sectional { i3x\|
curves through the candela distribution. *"F*6+}w"
The orientation of the candela plots is determined by the Normal Vector and the Qd% (]L[N.
Up Vector, as specified in the Analysis|Candela Options dialog box. The L:lnm9<
normal vector specifies the axis of the candela plot and the up vector specifies L7(.dO 0C
“which way is up.”
