给个英文的.个人理解可能会有点出入.基本上是这个意思. SOY#, Zu
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric CX (yrP6;
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 0Nzv@g{3
radiometric units, an intensity plot is in units of watts per steradian. Candela plots aIyY %QT
are commonly used in the design of illumination systems, especially those used in a[OLS+zf!P
the far field. dJgOfg^
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface H5rNLfw
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Kwmo)|7uPU
the model and “go off to infinity.” Exiting rays are the collection of ray segments 1 jd=R7
following the intersection point of a ray at a surface. Due to ray splitting, several ,}$x'8v
ray segments may contribute to the candela data for each incident ray. Incident j F2GHyB
rays are the collection of ray segments which intersect the selected surface. No i}12mjF
surface selection is required for Missed rays but one is necessary for Exiting and 5 s2}nIe
Incident rays. Y
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The candela plots represent flux versus angle and can be smoothed using the vG=$UUh@~
Candela Options dialog box. The iso-candela plots can be presented as false P=hf/jOv9
color maps or contour plots. The distribution plots are graphs of cross-sectional LWR &(p.%
curves through the candela distribution. '
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The orientation of the candela plots is determined by the Normal Vector and the 04LVa|Y@U
Up Vector, as specified in the Analysis|Candela Options dialog box. The s%re>)=|
normal vector specifies the axis of the candela plot and the up vector specifies s~'C 'B?
“which way is up.”
