给个英文的.个人理解可能会有点出入.基本上是这个意思. ?\L@Pr|=Dr
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric vrXUS9i.
units, a luminous intensity plot is in units of candelas (lumens per steradian). In E? l_ *[G
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Qr6[h!
are commonly used in the design of illumination systems, especially those used in h2# G
the far field. U iqHUrx
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface `PX SQf
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” $vnshU8/v
the model and “go off to infinity.” Exiting rays are the collection of ray segments h|$ .`$
following the intersection point of a ray at a surface. Due to ray splitting, several 8_ US.52V
ray segments may contribute to the candela data for each incident ray. Incident 3K c
rays are the collection of ray segments which intersect the selected surface. No 8
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surface selection is required for Missed rays but one is necessary for Exiting and v}XMFC !
Incident rays. + @ga
The candela plots represent flux versus angle and can be smoothed using the Zg "g/I.+d
Candela Options dialog box. The iso-candela plots can be presented as false S c_#BD.
color maps or contour plots. The distribution plots are graphs of cross-sectional <t>"b|fW
curves through the candela distribution. hg_@Ui@[z
The orientation of the candela plots is determined by the Normal Vector and the
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Up Vector, as specified in the Analysis|Candela Options dialog box. The 8<#X]I_eP+
normal vector specifies the axis of the candela plot and the up vector specifies WI/&r5rq
“which way is up.”
