给个英文的.个人理解可能会有点出入.基本上是这个意思. ])T_& %
:B_ itl0{e
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric x6~`{N1N
M
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Dmk~t="Y
radiometric units, an intensity plot is in units of watts per steradian. Candela plots X@7e 7
are commonly used in the design of illumination systems, especially those used in @|o^ ]-,
the far field. 9y"\]G77E
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface /aMeKM[L`
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 1j^FNg ~
the model and “go off to infinity.” Exiting rays are the collection of ray segments N5GQ2V
following the intersection point of a ray at a surface. Due to ray splitting, several dzc.s8T(0
ray segments may contribute to the candela data for each incident ray. Incident CbRl/ 68HY
rays are the collection of ray segments which intersect the selected surface. No (AgM7H0
surface selection is required for Missed rays but one is necessary for Exiting and |(1z ?Spbe
Incident rays. cd*F;h
The candela plots represent flux versus angle and can be smoothed using the @7B!(Q
Candela Options dialog box. The iso-candela plots can be presented as false Si%K|$?@
color maps or contour plots. The distribution plots are graphs of cross-sectional >RT02Ey>
curves through the candela distribution. !Zf)N_k
The orientation of the candela plots is determined by the Normal Vector and the 8h7z
Up Vector, as specified in the Analysis|Candela Options dialog box. The 8|p*T&Cn&
normal vector specifies the axis of the candela plot and the up vector specifies 4#@zn 2l
“which way is up.”
