给个英文的.个人理解可能会有点出入.基本上是这个意思. 5<L+T
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric by0M (h
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 0?8{q{ o+
radiometric units, an intensity plot is in units of watts per steradian. Candela plots GJ4R f%
are commonly used in the design of illumination systems, especially those used in X2hyxTOp
the far field. e khx?rz
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 0|@* `-:VO
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” K, L
the model and “go off to infinity.” Exiting rays are the collection of ray segments N?krlR
following the intersection point of a ray at a surface. Due to ray splitting, several s c
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ray segments may contribute to the candela data for each incident ray. Incident 8!u8ZvbFG
rays are the collection of ray segments which intersect the selected surface. No `f+l\'.s
surface selection is required for Missed rays but one is necessary for Exiting and 2/V9Or 52
Incident rays. l<=Y.P_2
The candela plots represent flux versus angle and can be smoothed using the u P veAK}h
Candela Options dialog box. The iso-candela plots can be presented as false 0'4V *Y
color maps or contour plots. The distribution plots are graphs of cross-sectional Uk|(VR9
curves through the candela distribution. D\i8WU
The orientation of the candela plots is determined by the Normal Vector and the Fb9!x/$tGV
Up Vector, as specified in the Analysis|Candela Options dialog box. The %vFoTu)2
normal vector specifies the axis of the candela plot and the up vector specifies Z 361ko}
“which way is up.”
