给个英文的.个人理解可能会有点出入.基本上是这个意思. qe$^q PVOx`<ng A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ^:=f^N=^ units, a luminous intensity plot is in units of candelas (lumens per steradian). In h"+ `13 radiometric units, an intensity plot is in units of watts per steradian. Candela plots 3AcD,,M>> are commonly used in the design of illumination systems, especially those used in ;gg\;i}^ the far field. V5f9]D Candela data can be collected from ray sets of Missed rays, rays Exiting a surface :4gLjzL or rays Incident on a surface. Missed rays are a collection of all rays that “leave” gB'fFkd the model and “go off to infinity.” Exiting rays are the collection of ray segments rN)V[5R#M following the intersection point of a ray at a surface. Due to ray splitting, several O1&b]C# ray segments may contribute to the candela data for each incident ray. Incident &opd2 rays are the collection of ray segments which intersect the selected surface. No LE6.nmvS surface selection is required for Missed rays but one is necessary for Exiting and 5ExDB6Bx@y Incident rays. ufV!+$C)is The candela plots represent flux versus angle and can be smoothed using the Q]/Uq~m C Candela Options dialog box. The iso-candela plots can be presented as false V5F%_,No color maps or contour plots. The distribution plots are graphs of cross-sectional <[:o !$ curves through the candela distribution. IuF_M<d, The orientation of the candela plots is determined by the Normal Vector and the \!]hU%Un Up Vector, as specified in the Analysis|Candela Options dialog box. The :Y,BdU normal vector specifies the axis of the candela plot and the up vector specifies Iq7}
“which way is up.”