给个英文的.个人理解可能会有点出入.基本上是这个意思. N2Qb+ $ vt6~nfI A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric C9VtRq units, a luminous intensity plot is in units of candelas (lumens per steradian). In F`eo3z radiometric units, an intensity plot is in units of watts per steradian. Candela plots 0/4"Jh$t are commonly used in the design of illumination systems, especially those used in &VdKL2 the far field. d&owS+B{48 Candela data can be collected from ray sets of Missed rays, rays Exiting a surface }9*N EU)o or rays Incident on a surface. Missed rays are a collection of all rays that “leave” xO0}A1t
Wd the model and “go off to infinity.” Exiting rays are the collection of ray segments !M(3[(Ni following the intersection point of a ray at a surface. Due to ray splitting, several d cG)ql4d ray segments may contribute to the candela data for each incident ray. Incident 6=3;(2u[C" rays are the collection of ray segments which intersect the selected surface. No Bgf'Hm%r surface selection is required for Missed rays but one is necessary for Exiting and PZYVLUw
` Incident rays. c*DBa]u2 The candela plots represent flux versus angle and can be smoothed using the >ca w
: Candela Options dialog box. The iso-candela plots can be presented as false QTmMj@R&( color maps or contour plots. The distribution plots are graphs of cross-sectional LKsK!X curves through the candela distribution. jG^f_w The orientation of the candela plots is determined by the Normal Vector and the "*HVL Up Vector, as specified in the Analysis|Candela Options dialog box. The ur|
vh5 normal vector specifies the axis of the candela plot and the up vector specifies +]$c+!khj “which way is up.”