给个英文的.个人理解可能会有点出入.基本上是这个意思. A3@6N( ?6Y?a2 | A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 3m)y|$R units, a luminous intensity plot is in units of candelas (lumens per steradian). In |Xy6PN8 radiometric units, an intensity plot is in units of watts per steradian. Candela plots M =r)I~ are commonly used in the design of illumination systems, especially those used in ^y%T~dLkp' the far field. '`KY!]L Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ')3
bl3: or rays Incident on a surface. Missed rays are a collection of all rays that “leave” IO-Ow! the model and “go off to infinity.” Exiting rays are the collection of ray segments }`~+]9< following the intersection point of a ray at a surface. Due to ray splitting, several sON|w86B ray segments may contribute to the candela data for each incident ray. Incident @<&m|qtMsz rays are the collection of ray segments which intersect the selected surface. No %bfQ$a: surface selection is required for Missed rays but one is necessary for Exiting and ~Jz6O U*z Incident rays. "#\;H$+ The candela plots represent flux versus angle and can be smoothed using the ySDH"|0 Candela Options dialog box. The iso-candela plots can be presented as false oILZgNe' color maps or contour plots. The distribution plots are graphs of cross-sectional :6\qpex curves through the candela distribution. 9qG6Pb The orientation of the candela plots is determined by the Normal Vector and the )Z9>$V$j Up Vector, as specified in the Analysis|Candela Options dialog box. The k\GcHI- normal vector specifies the axis of the candela plot and the up vector specifies dlTt_. “which way is up.”