给个英文的.个人理解可能会有点出入.基本上是这个意思. 4Y bC(f
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric {j(4m
units, a luminous intensity plot is in units of candelas (lumens per steradian). In !>;w!^U
radiometric units, an intensity plot is in units of watts per steradian. Candela plots PB~_I=
are commonly used in the design of illumination systems, especially those used in TW`mxj_J2
the far field. j.-VJo)
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 6X+}>qy
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” L9IGK<
the model and “go off to infinity.” Exiting rays are the collection of ray segments g" t^r3
following the intersection point of a ray at a surface. Due to ray splitting, several /rF8@ l
ray segments may contribute to the candela data for each incident ray. Incident !awh*Xj6
rays are the collection of ray segments which intersect the selected surface. No UFZ"C,
surface selection is required for Missed rays but one is necessary for Exiting and bLG ]Wa
Incident rays. rb_Z5T
The candela plots represent flux versus angle and can be smoothed using the d
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Candela Options dialog box. The iso-candela plots can be presented as false &R]pw`mTH
color maps or contour plots. The distribution plots are graphs of cross-sectional ;?6>mh( `
curves through the candela distribution. {V2bU}5
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The orientation of the candela plots is determined by the Normal Vector and the 0*(K DDv
Up Vector, as specified in the Analysis|Candela Options dialog box. The @vH2Vydu
normal vector specifies the axis of the candela plot and the up vector specifies V> a*3D
“which way is up.”
