给个英文的.个人理解可能会有点出入.基本上是这个意思. YPY'[j(p`n 'K0=FPB/@ A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric a6v ls]? units, a luminous intensity plot is in units of candelas (lumens per steradian). In j%y)%4F8 radiometric units, an intensity plot is in units of watts per steradian. Candela plots =*Ad are commonly used in the design of illumination systems, especially those used in -P5M(Rt the far field. U;Ne"Jh Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ^s=p'&6 or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ?{Gf'Y}y& the model and “go off to infinity.” Exiting rays are the collection of ray segments Z$'483< following the intersection point of a ray at a surface. Due to ray splitting, several %G%D[ i] ray segments may contribute to the candela data for each incident ray. Incident gU^2;C rays are the collection of ray segments which intersect the selected surface. No R#QcQx surface selection is required for Missed rays but one is necessary for Exiting and KW~fW r8 Incident rays. STxreW1 The candela plots represent flux versus angle and can be smoothed using the iKu~o.yy Candela Options dialog box. The iso-candela plots can be presented as false (.DX</f/4 color maps or contour plots. The distribution plots are graphs of cross-sectional a#qC.,$A curves through the candela distribution. sb7~sa&- The orientation of the candela plots is determined by the Normal Vector and the [qEd`8V( Up Vector, as specified in the Analysis|Candela Options dialog box. The 5yhfCe m| normal vector specifies the axis of the candela plot and the up vector specifies Q41eYzAi “which way is up.”