给个英文的.个人理解可能会有点出入.基本上是这个意思. $+Vp>
G'
a{ ;3
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric F\hU
V[
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 5o R/ Q|^
radiometric units, an intensity plot is in units of watts per steradian. Candela plots #~ >ykuq
are commonly used in the design of illumination systems, especially those used in 4"y 1M=he
the far field. H+2m
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 58 .b@@T
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Nh/B8:035
the model and “go off to infinity.” Exiting rays are the collection of ray segments wT+b|K
following the intersection point of a ray at a surface. Due to ray splitting, several Q GQ}I
ray segments may contribute to the candela data for each incident ray. Incident K\vyfYi
rays are the collection of ray segments which intersect the selected surface. No Lb%Wz*Fa%!
surface selection is required for Missed rays but one is necessary for Exiting and I2<t?c:Pn<
Incident rays. 9 54O=9PQ
The candela plots represent flux versus angle and can be smoothed using the lQnqPQY
Candela Options dialog box. The iso-candela plots can be presented as false r1QLSD]i6
color maps or contour plots. The distribution plots are graphs of cross-sectional
2<' 1m{
curves through the candela distribution. |o I]
The orientation of the candela plots is determined by the Normal Vector and the %Ut7%obpi
Up Vector, as specified in the Analysis|Candela Options dialog box. The 2n8spLZYGY
normal vector specifies the axis of the candela plot and the up vector specifies 1{7*0cv$iL
“which way is up.”
