给个英文的.个人理解可能会有点出入.基本上是这个意思. 8i$|j ~M a
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric <e! TF @
units, a luminous intensity plot is in units of candelas (lumens per steradian). In [!U%''
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 6,4vs+(|\
are commonly used in the design of illumination systems, especially those used in KsGW@Ho:
the far field. Gt{%O>P8t
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface A *BN
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” %KF I~Qk
the model and “go off to infinity.” Exiting rays are the collection of ray segments Yv=L'0K&
following the intersection point of a ray at a surface. Due to ray splitting, several >Ec;6V
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ray segments may contribute to the candela data for each incident ray. Incident %V;* E]
rays are the collection of ray segments which intersect the selected surface. No 4Kt0}W
surface selection is required for Missed rays but one is necessary for Exiting and H6Zo|n
Incident rays. Fr50hrtkU
The candela plots represent flux versus angle and can be smoothed using the PkFG0
Candela Options dialog box. The iso-candela plots can be presented as false qbQ dx Kk
color maps or contour plots. The distribution plots are graphs of cross-sectional ?Xpk"N7
curves through the candela distribution. h>>~B i
The orientation of the candela plots is determined by the Normal Vector and the t[;-gi,,
Up Vector, as specified in the Analysis|Candela Options dialog box. The 6 _V1s1F
normal vector specifies the axis of the candela plot and the up vector specifies pj7a l;
“which way is up.”
