给个英文的.个人理解可能会有点出入.基本上是这个意思.
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric \OILWQ[/
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 0AK,&nbF
radiometric units, an intensity plot is in units of watts per steradian. Candela plots mLh kI!4[
are commonly used in the design of illumination systems, especially those used in 2P#=a?~[
the far field. /E;y,o75
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface #[{3 } %b
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” wh6yPVVF/
the model and “go off to infinity.” Exiting rays are the collection of ray segments /ID3s`D)
following the intersection point of a ray at a surface. Due to ray splitting, several uhyj5u)
ray segments may contribute to the candela data for each incident ray. Incident xu5ia|gYz7
rays are the collection of ray segments which intersect the selected surface. No =Prb'8 W
surface selection is required for Missed rays but one is necessary for Exiting and kIHDeo%K}
Incident rays. Y;4!i?el
The candela plots represent flux versus angle and can be smoothed using the 3`E=#f f%
Candela Options dialog box. The iso-candela plots can be presented as false s m,VYYs
color maps or contour plots. The distribution plots are graphs of cross-sectional ]\-^>!F #K
curves through the candela distribution. S$TmZk=
The orientation of the candela plots is determined by the Normal Vector and the G!w"{Bk?9
Up Vector, as specified in the Analysis|Candela Options dialog box. The in+}/mwfC
normal vector specifies the axis of the candela plot and the up vector specifies Q;11N7+
“which way is up.”
