给个英文的.个人理解可能会有点出入.基本上是这个意思. ~NQ72wph{
/Y'Vh^9/T
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric i (iXD
units, a luminous intensity plot is in units of candelas (lumens per steradian). In u /M+u;
radiometric units, an intensity plot is in units of watts per steradian. Candela plots T;,cN7>>O
are commonly used in the design of illumination systems, especially those used in (CsD*U`h
the far field. !Cr(P e]
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface %@.v2 cT
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Y8o)FVcyNy
the model and “go off to infinity.” Exiting rays are the collection of ray segments t0IEaj75c
following the intersection point of a ray at a surface. Due to ray splitting, several )rekY;
ray segments may contribute to the candela data for each incident ray. Incident a{R%#e\n
rays are the collection of ray segments which intersect the selected surface. No ](&{: >RNJ
surface selection is required for Missed rays but one is necessary for Exiting and CitDm1DXt/
Incident rays. s;3= {e.
The candela plots represent flux versus angle and can be smoothed using the ly:q6i
Candela Options dialog box. The iso-candela plots can be presented as false M+ w=O!dq
color maps or contour plots. The distribution plots are graphs of cross-sectional B]uc<`f
curves through the candela distribution. tD+9kf2
The orientation of the candela plots is determined by the Normal Vector and the ] =>F.GE
Up Vector, as specified in the Analysis|Candela Options dialog box. The 1IZ3=6
normal vector specifies the axis of the candela plot and the up vector specifies 1`a5C.v
“which way is up.”
