给个英文的.个人理解可能会有点出入.基本上是这个意思. h=,hYz?] [qW%H,_ A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric |!9xL*A units, a luminous intensity plot is in units of candelas (lumens per steradian). In 1Ml<> radiometric units, an intensity plot is in units of watts per steradian. Candela plots FZn1$_Svr are commonly used in the design of illumination systems, especially those used in >Oj$Dn= the far field. Z5n-3h!+ED Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 4r`I) or rays Incident on a surface. Missed rays are a collection of all rays that “leave” }<X* :%#b the model and “go off to infinity.” Exiting rays are the collection of ray segments AWi>(wk< following the intersection point of a ray at a surface. Due to ray splitting, several
;}?ZH4.S ray segments may contribute to the candela data for each incident ray. Incident br
Iz8] rays are the collection of ray segments which intersect the selected surface. No k2$pcR,WM surface selection is required for Missed rays but one is necessary for Exiting and =1dczJHV Incident rays. }nX0h6+1 The candela plots represent flux versus angle and can be smoothed using the (3mL!1\ Candela Options dialog box. The iso-candela plots can be presented as false @'}2xw[eU color maps or contour plots. The distribution plots are graphs of cross-sectional G![d_F"e curves through the candela distribution. g_IcF><F The orientation of the candela plots is determined by the Normal Vector and the Jw@X5-(Cp Up Vector, as specified in the Analysis|Candela Options dialog box. The -&`_bf%M normal vector specifies the axis of the candela plot and the up vector specifies \XmplG: “which way is up.”