给个英文的.个人理解可能会有点出入.基本上是这个意思. '5BD%#[
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric +-j-)WU?,
units, a luminous intensity plot is in units of candelas (lumens per steradian). In G ?$ @6
radiometric units, an intensity plot is in units of watts per steradian. Candela plots .yj@hpJM
are commonly used in the design of illumination systems, especially those used in |fgUW.
the far field. =x8[%+
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ]bY|> q
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” #hxYB
the model and “go off to infinity.” Exiting rays are the collection of ray segments g{Hgs
following the intersection point of a ray at a surface. Due to ray splitting, several iwK.* 07+
ray segments may contribute to the candela data for each incident ray. Incident Z\nDR|3
rays are the collection of ray segments which intersect the selected surface. No ,u
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surface selection is required for Missed rays but one is necessary for Exiting and 7[1Lh'u
Incident rays. VmqJMU>.
The candela plots represent flux versus angle and can be smoothed using the 3=.YQE0!dx
Candela Options dialog box. The iso-candela plots can be presented as false /Q;wz!V$
color maps or contour plots. The distribution plots are graphs of cross-sectional b(0<,r8
curves through the candela distribution. e34>q:#5l
The orientation of the candela plots is determined by the Normal Vector and the qq5X3K2&
Up Vector, as specified in the Analysis|Candela Options dialog box. The Pf[E..HF*d
normal vector specifies the axis of the candela plot and the up vector specifies sUG!dwqqd
“which way is up.”
