给个英文的.个人理解可能会有点出入.基本上是这个意思. Jon3ywd1Y KRm)|bgE A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric w$s6NBF7 units, a luminous intensity plot is in units of candelas (lumens per steradian). In IV1O/lGp radiometric units, an intensity plot is in units of watts per steradian. Candela plots ShtV2}s| are commonly used in the design of illumination systems, especially those used in ZX-A} the far field. KJ&I4CU]^ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface G?~Yw'R^8 or rays Incident on a surface. Missed rays are a collection of all rays that “leave” pIrL7Pb0 the model and “go off to infinity.” Exiting rays are the collection of ray segments 3r^||(_u following the intersection point of a ray at a surface. Due to ray splitting, several bly `mp8# ray segments may contribute to the candela data for each incident ray. Incident $pPc}M[h rays are the collection of ray segments which intersect the selected surface. No iX2exJto surface selection is required for Missed rays but one is necessary for Exiting and zGd[sjL Incident rays. evE:FiDm(j The candela plots represent flux versus angle and can be smoothed using the mV}8s]29 Candela Options dialog box. The iso-candela plots can be presented as false Z
*tHZ7b color maps or contour plots. The distribution plots are graphs of cross-sectional sjLm-pn3 curves through the candela distribution.
qOD^P The orientation of the candela plots is determined by the Normal Vector and the (@BB@G Up Vector, as specified in the Analysis|Candela Options dialog box. The g]MgT-C| normal vector specifies the axis of the candela plot and the up vector specifies j/wQ2"@a “which way is up.”