给个英文的.个人理解可能会有点出入.基本上是这个意思. \Rny*px
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric USBQE t
units, a luminous intensity plot is in units of candelas (lumens per steradian). In mOE *[S)
radiometric units, an intensity plot is in units of watts per steradian. Candela plots s6bsVAO>
are commonly used in the design of illumination systems, especially those used in C%X O| sP
the far field. s*izhjjX
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ~K;QdV=YX
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” n<ZPWlJ
the model and “go off to infinity.” Exiting rays are the collection of ray segments BN_h3|)
following the intersection point of a ray at a surface. Due to ray splitting, several +<7Oj s>o
ray segments may contribute to the candela data for each incident ray. Incident V%s
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rays are the collection of ray segments which intersect the selected surface. No L)sg W(@2
surface selection is required for Missed rays but one is necessary for Exiting and (@1:1K(
Incident rays. @5%&wC
The candela plots represent flux versus angle and can be smoothed using the vQ MBJ&
Candela Options dialog box. The iso-candela plots can be presented as false x e`^)2z
color maps or contour plots. The distribution plots are graphs of cross-sectional YlHP:ZW-cu
curves through the candela distribution. A l U^ ,X
The orientation of the candela plots is determined by the Normal Vector and the ||$&o!;/L
Up Vector, as specified in the Analysis|Candela Options dialog box. The 2c9?,Le/;
normal vector specifies the axis of the candela plot and the up vector specifies Ke$_l]}
“which way is up.”
