给个英文的.个人理解可能会有点出入.基本上是这个意思. rtz%(4aS
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric l%^'K%'b
units, a luminous intensity plot is in units of candelas (lumens per steradian). In S/
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots %HJ_0qg
are commonly used in the design of illumination systems, especially those used in :B<lDcFKJ
the far field. nO~TW
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface N(]>( S
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” UUx0#D/U0C
the model and “go off to infinity.” Exiting rays are the collection of ray segments `q
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following the intersection point of a ray at a surface. Due to ray splitting, several [lsr[`SJ<
ray segments may contribute to the candela data for each incident ray. Incident !=.5$/
rays are the collection of ray segments which intersect the selected surface. No \7}X^]UV x
surface selection is required for Missed rays but one is necessary for Exiting and shlL(&Py
Incident rays. c4R6E~S
The candela plots represent flux versus angle and can be smoothed using the TCSm#?[B
Candela Options dialog box. The iso-candela plots can be presented as false $zTjh~ 9
color maps or contour plots. The distribution plots are graphs of cross-sectional zX!zG<<K
curves through the candela distribution. EV@xUq!x .
The orientation of the candela plots is determined by the Normal Vector and the : /9@p
Up Vector, as specified in the Analysis|Candela Options dialog box. The nJYcC"f
normal vector specifies the axis of the candela plot and the up vector specifies J}coWjw`q
“which way is up.”
