给个英文的.个人理解可能会有点出入.基本上是这个意思. #||D,[ _=+
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric \YSprXe
units, a luminous intensity plot is in units of candelas (lumens per steradian). In v_Hy:O}R
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 26; Gt8
are commonly used in the design of illumination systems, especially those used in F5y&"Y_
the far field. '6cXCO-_P
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 6!se,SCvw
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” X}wo$t
the model and “go off to infinity.” Exiting rays are the collection of ray segments M.HMn N#
following the intersection point of a ray at a surface. Due to ray splitting, several DkSs^ym
ray segments may contribute to the candela data for each incident ray. Incident B1A:} #
rays are the collection of ray segments which intersect the selected surface. No ~9PZ/(
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surface selection is required for Missed rays but one is necessary for Exiting and 4Y{;%;-i
Incident rays. I_ AFHrj
The candela plots represent flux versus angle and can be smoothed using the 91 -[[<
Candela Options dialog box. The iso-candela plots can be presented as false 8Wo!NG:V5
color maps or contour plots. The distribution plots are graphs of cross-sectional yp[,WZt
curves through the candela distribution. m L-6+pJ@
The orientation of the candela plots is determined by the Normal Vector and the H>Ucmd;ay
Up Vector, as specified in the Analysis|Candela Options dialog box. The 6a<zZO`Z6+
normal vector specifies the axis of the candela plot and the up vector specifies &;sW4jnt
“which way is up.”
