给个英文的.个人理解可能会有点出入.基本上是这个意思. HZB>{O
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric #Y `~(K47
units, a luminous intensity plot is in units of candelas (lumens per steradian). In _/$Bpr{R
radiometric units, an intensity plot is in units of watts per steradian. Candela plots n
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are commonly used in the design of illumination systems, especially those used in ^ 7cGq+t
the far field. \ a<h/ 4#|
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface }OR@~V{Gj
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” @ V sG'
the model and “go off to infinity.” Exiting rays are the collection of ray segments J?1 uKR
following the intersection point of a ray at a surface. Due to ray splitting, several ^ogt+6c
ray segments may contribute to the candela data for each incident ray. Incident 2 86;=rN]*
rays are the collection of ray segments which intersect the selected surface. No bHYy }weZ
surface selection is required for Missed rays but one is necessary for Exiting and Yui3+}Ms
Incident rays. orpri O|qD
The candela plots represent flux versus angle and can be smoothed using the dr}`H,X"3
Candela Options dialog box. The iso-candela plots can be presented as false mHTXni<!
color maps or contour plots. The distribution plots are graphs of cross-sectional -#[a7',Z;
curves through the candela distribution. TDKki(o=~
The orientation of the candela plots is determined by the Normal Vector and the l`{\"#4
Up Vector, as specified in the Analysis|Candela Options dialog box. The } 5[qo`M
normal vector specifies the axis of the candela plot and the up vector specifies BwG fTua
“which way is up.”
