给个英文的.个人理解可能会有点出入.基本上是这个意思. E;"VI2F
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 1k"i"kRM
units, a luminous intensity plot is in units of candelas (lumens per steradian). In {3!A \OR
radiometric units, an intensity plot is in units of watts per steradian. Candela plots YeB C6`7y
are commonly used in the design of illumination systems, especially those used in ) 5Cqyp~P
the far field. r\y\]AmF
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ]n$ v ^
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” rERtOgi
the model and “go off to infinity.” Exiting rays are the collection of ray segments Lf{pTxKr
following the intersection point of a ray at a surface. Due to ray splitting, several CM `Q((
ray segments may contribute to the candela data for each incident ray. Incident kpk ^Uw%f
rays are the collection of ray segments which intersect the selected surface. No r8A'8g4cM
surface selection is required for Missed rays but one is necessary for Exiting and R80|q#h,]
Incident rays. TBHd)BhI.
The candela plots represent flux versus angle and can be smoothed using the @#9x Ss#
Candela Options dialog box. The iso-candela plots can be presented as false ~u?rjkSFoh
color maps or contour plots. The distribution plots are graphs of cross-sectional AAF;M }le,
curves through the candela distribution. 2"o <>d
The orientation of the candela plots is determined by the Normal Vector and the YG>E op
Up Vector, as specified in the Analysis|Candela Options dialog box. The I Efm>N-]
normal vector specifies the axis of the candela plot and the up vector specifies Ysi@wK-LnF
“which way is up.”
