给个英文的.个人理解可能会有点出入.基本上是这个意思. /IRXk[ ;H~<.QW A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 9ZJ 8QH units, a luminous intensity plot is in units of candelas (lumens per steradian). In BXYH&2]Q radiometric units, an intensity plot is in units of watts per steradian. Candela plots HVHv,:bPo are commonly used in the design of illumination systems, especially those used in I@9'd$YY the far field. 6u+aP Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ySmbX or rays Incident on a surface. Missed rays are a collection of all rays that “leave” [DM0'4 the model and “go off to infinity.” Exiting rays are the collection of ray segments OQKeU0v following the intersection point of a ray at a surface. Due to ray splitting, several @0@ZlHwM ray segments may contribute to the candela data for each incident ray. Incident mvZ#FF1,J rays are the collection of ray segments which intersect the selected surface. No 8;DDCop 8L surface selection is required for Missed rays but one is necessary for Exiting and ?![[la+f Incident rays. kzRJzJq uP The candela plots represent flux versus angle and can be smoothed using the
6j<!W+~G Candela Options dialog box. The iso-candela plots can be presented as false byM-$l color maps or contour plots. The distribution plots are graphs of cross-sectional rYr*D[m] curves through the candela distribution. |sReHt2)d The orientation of the candela plots is determined by the Normal Vector and the /gZyl|kdy Up Vector, as specified in the Analysis|Candela Options dialog box. The @GFB{ ;= normal vector specifies the axis of the candela plot and the up vector specifies /!?LBtqy “which way is up.”