给个英文的.个人理解可能会有点出入.基本上是这个意思. 0A.PD rM:
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ) ]73S@P(=
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ozU2
radiometric units, an intensity plot is in units of watts per steradian. Candela plots [ a@ B
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are commonly used in the design of illumination systems, especially those used in B~?c3:6
the far field. HL@TcfOe~
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface cv= \g Z
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” |"Z-7@/k$i
the model and “go off to infinity.” Exiting rays are the collection of ray segments wS V@=)H\:
following the intersection point of a ray at a surface. Due to ray splitting, several i-b1d'?Rb
ray segments may contribute to the candela data for each incident ray. Incident zO%w_7 w
rays are the collection of ray segments which intersect the selected surface. No 6J\q`q(W(
surface selection is required for Missed rays but one is necessary for Exiting and \*uugw,\y
Incident rays. Uj,g ]e 8e
The candela plots represent flux versus angle and can be smoothed using the wazP,9W?
Candela Options dialog box. The iso-candela plots can be presented as false F99A;M8(
color maps or contour plots. The distribution plots are graphs of cross-sectional 8
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curves through the candela distribution. 8)pB_en3sO
The orientation of the candela plots is determined by the Normal Vector and the VgA48qZ
Up Vector, as specified in the Analysis|Candela Options dialog box. The c}% es=@
normal vector specifies the axis of the candela plot and the up vector specifies M|k&TTV
“which way is up.”
