给个英文的.个人理解可能会有点出入.基本上是这个意思. .lgm "
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 5n::]Q% =D
units, a luminous intensity plot is in units of candelas (lumens per steradian). In GB*^?Ii
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 5: ~ zlg
are commonly used in the design of illumination systems, especially those used in g |]Hm*
the far field. ?U:c\TA,m
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface gxDyCL$h3
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” + >tSO!}[
the model and “go off to infinity.” Exiting rays are the collection of ray segments mph s^k< Z
following the intersection point of a ray at a surface. Due to ray splitting, several So NgDFD
ray segments may contribute to the candela data for each incident ray. Incident mt *Dx
rays are the collection of ray segments which intersect the selected surface. No >)`*:_{
surface selection is required for Missed rays but one is necessary for Exiting and U,< ?]h
Incident rays. ;P8.U(
The candela plots represent flux versus angle and can be smoothed using the Pyw UPsJ
Candela Options dialog box. The iso-candela plots can be presented as false 8P% J ky&(
color maps or contour plots. The distribution plots are graphs of cross-sectional "NV~lJS%
curves through the candela distribution.
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The orientation of the candela plots is determined by the Normal Vector and the JWQd6JQ_~V
Up Vector, as specified in the Analysis|Candela Options dialog box. The =E HKu|rX~
normal vector specifies the axis of the candela plot and the up vector specifies ypvz&SzIh
“which way is up.”
