给个英文的.个人理解可能会有点出入.基本上是这个意思. sr r
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Umz KY
units, a luminous intensity plot is in units of candelas (lumens per steradian). In AV:h BoO
radiometric units, an intensity plot is in units of watts per steradian. Candela plots bENdMH";
are commonly used in the design of illumination systems, especially those used in c>,'Y)8
the far field. D|lzGt
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface j:^#rFD4?
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” s28`OKC}
the model and “go off to infinity.” Exiting rays are the collection of ray segments pf2[ , v/
following the intersection point of a ray at a surface. Due to ray splitting, several 3]OE} [R
ray segments may contribute to the candela data for each incident ray. Incident J; 3{3
rays are the collection of ray segments which intersect the selected surface. No z#8~iF1
surface selection is required for Missed rays but one is necessary for Exiting and ")_|69 VX
Incident rays. ^T( .k=
The candela plots represent flux versus angle and can be smoothed using the O)C\v F#
Candela Options dialog box. The iso-candela plots can be presented as false bh s5x
color maps or contour plots. The distribution plots are graphs of cross-sectional 10G}{
curves through the candela distribution. xj<Rp|7&
The orientation of the candela plots is determined by the Normal Vector and the v V'EZ ?
Up Vector, as specified in the Analysis|Candela Options dialog box. The o906/5M
normal vector specifies the axis of the candela plot and the up vector specifies gcii9vz
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“which way is up.”
