给个英文的.个人理解可能会有点出入.基本上是这个意思. "%peYNZ &%
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric \rj>T6
units, a luminous intensity plot is in units of candelas (lumens per steradian). In JkShtLEr
radiometric units, an intensity plot is in units of watts per steradian. Candela plots %cO^:
are commonly used in the design of illumination systems, especially those used in 2]of 4
the far field. o|kiwr}Y
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ^ YOC HXg
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” HOaNhJ{7D
the model and “go off to infinity.” Exiting rays are the collection of ray segments q\pI&B
following the intersection point of a ray at a surface. Due to ray splitting, several *O|_)G
ray segments may contribute to the candela data for each incident ray. Incident CP'b,}Dd?I
rays are the collection of ray segments which intersect the selected surface. No NiH =T
surface selection is required for Missed rays but one is necessary for Exiting and aP$it 6Z
Incident rays. - 1{f(/
The candela plots represent flux versus angle and can be smoothed using the 4aP 96
Candela Options dialog box. The iso-candela plots can be presented as false n!dXjInV
color maps or contour plots. The distribution plots are graphs of cross-sectional T>hrKn.!D:
curves through the candela distribution. DFkDlx
The orientation of the candela plots is determined by the Normal Vector and the kzk8b?rOA
Up Vector, as specified in the Analysis|Candela Options dialog box. The $d-$dM? R5
normal vector specifies the axis of the candela plot and the up vector specifies Q7.jSL6
“which way is up.”
