给个英文的.个人理解可能会有点出入.基本上是这个意思. +SmcZ^\OZ
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric @$~ BU;kR
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ,$habq=;
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ~4wbIE_r N
are commonly used in the design of illumination systems, especially those used in 'A,&9E{%1
the far field. sa`7_KB
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface :XMw=" u=
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ?J+[|*'yK
the model and “go off to infinity.” Exiting rays are the collection of ray segments u!%]?MSc
following the intersection point of a ray at a surface. Due to ray splitting, several Oah}7!a)
ray segments may contribute to the candela data for each incident ray. Incident Dsq sMlB{
rays are the collection of ray segments which intersect the selected surface. No 9 jiZtwRpk
surface selection is required for Missed rays but one is necessary for Exiting and :YB:)wV,P
Incident rays. _VR Sdr5
The candela plots represent flux versus angle and can be smoothed using the ]do0{I%\eq
Candela Options dialog box. The iso-candela plots can be presented as false B7TA:K
color maps or contour plots. The distribution plots are graphs of cross-sectional _y)#N<
curves through the candela distribution. aT F}
The orientation of the candela plots is determined by the Normal Vector and the *&B*/H AN
Up Vector, as specified in the Analysis|Candela Options dialog box. The e+=Oj o#
normal vector specifies the axis of the candela plot and the up vector specifies `-4c}T
“which way is up.”
