给个英文的.个人理解可能会有点出入.基本上是这个意思. fJOwE
g| Hsn'" A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Wn2'uZ5If units, a luminous intensity plot is in units of candelas (lumens per steradian). In r3qKT radiometric units, an intensity plot is in units of watts per steradian. Candela plots GXG 7P,p, are commonly used in the design of illumination systems, especially those used in 8yk7d76Y the far field. ?8N^jjG Candela data can be collected from ray sets of Missed rays, rays Exiting a surface oz:"w
nX or rays Incident on a surface. Missed rays are a collection of all rays that “leave” y4U|~\] the model and “go off to infinity.” Exiting rays are the collection of ray segments `*6|2 following the intersection point of a ray at a surface. Due to ray splitting, several ClG\Kpirh ray segments may contribute to the candela data for each incident ray. Incident R:4@a ':H rays are the collection of ray segments which intersect the selected surface. No j"K^zh surface selection is required for Missed rays but one is necessary for Exiting and LTxP@pr Incident rays. {xx}xib3 The candela plots represent flux versus angle and can be smoothed using the OClG dFJ| Candela Options dialog box. The iso-candela plots can be presented as false :_}xN!9LA color maps or contour plots. The distribution plots are graphs of cross-sectional Om^(CAp curves through the candela distribution. Unvl~lm6 The orientation of the candela plots is determined by the Normal Vector and the `Fie'[F5,) Up Vector, as specified in the Analysis|Candela Options dialog box. The A'BqNsy normal vector specifies the axis of the candela plot and the up vector specifies P -NR]f “which way is up.”