给个英文的.个人理解可能会有点出入.基本上是这个意思. ')C %CAYW
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric p.{9OrH(4
units, a luminous intensity plot is in units of candelas (lumens per steradian). In TAfLC)
radiometric units, an intensity plot is in units of watts per steradian. Candela plots v Y|{CBGbd
are commonly used in the design of illumination systems, especially those used in eu!B
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the far field. ^R\et.W`s
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface E/x2LYH
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” T)%34gN
the model and “go off to infinity.” Exiting rays are the collection of ray segments 2c?-_OCy;
following the intersection point of a ray at a surface. Due to ray splitting, several tbz?th\ #
ray segments may contribute to the candela data for each incident ray. Incident OcR6\t'
rays are the collection of ray segments which intersect the selected surface. No i4 BCm/h
surface selection is required for Missed rays but one is necessary for Exiting and ]fc9m~0N,\
Incident rays. ZJUTti D
The candela plots represent flux versus angle and can be smoothed using the Yphru" \$
Candela Options dialog box. The iso-candela plots can be presented as false -$Y@]uf^
color maps or contour plots. The distribution plots are graphs of cross-sectional EPx_xX
curves through the candela distribution. r\6 "mU
The orientation of the candela plots is determined by the Normal Vector and the E]G#"EV!Y
Up Vector, as specified in the Analysis|Candela Options dialog box. The ]ZJu
normal vector specifies the axis of the candela plot and the up vector specifies "[ f"h
“which way is up.”
