给个英文的.个人理解可能会有点出入.基本上是这个意思. eE '\h
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Tm
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In "l"zbW WOH
radiometric units, an intensity plot is in units of watts per steradian. Candela plots $<OX\f%
are commonly used in the design of illumination systems, especially those used in $_o nSYWr
the far field. g/)m bL>=
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 5(]=?$$*t
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” WnyEdYA
the model and “go off to infinity.” Exiting rays are the collection of ray segments A Qw1,tGV
following the intersection point of a ray at a surface. Due to ray splitting, several %A|9=x*
ray segments may contribute to the candela data for each incident ray. Incident KY~p> Jmh
rays are the collection of ray segments which intersect the selected surface. No g ]e^;
surface selection is required for Missed rays but one is necessary for Exiting and tt $DWmm
Incident rays. n<+g{QHi
The candela plots represent flux versus angle and can be smoothed using the s3Pr$h
Candela Options dialog box. The iso-candela plots can be presented as false T@ (MSgp9
color maps or contour plots. The distribution plots are graphs of cross-sectional GWsvN&nr
curves through the candela distribution. kj{z;5-dl
The orientation of the candela plots is determined by the Normal Vector and the $WED]X@X!
Up Vector, as specified in the Analysis|Candela Options dialog box. The Dp3&@M"^yY
normal vector specifies the axis of the candela plot and the up vector specifies *<c, x8\s9
“which way is up.”
