给个英文的.个人理解可能会有点出入.基本上是这个意思. e9~cBG|
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric #&^ZQs<
units, a luminous intensity plot is in units of candelas (lumens per steradian). In F=oHl@
radiometric units, an intensity plot is in units of watts per steradian. Candela plots fKL'/?LD]
are commonly used in the design of illumination systems, especially those used in GXOFk7 >
the far field. O"
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface m >]>$=%
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” abM 84EU
the model and “go off to infinity.” Exiting rays are the collection of ray segments :D"@6PC]
following the intersection point of a ray at a surface. Due to ray splitting, several 'R^i KN Ps
ray segments may contribute to the candela data for each incident ray. Incident wzD\8_;6N
rays are the collection of ray segments which intersect the selected surface. No zc6H o
surface selection is required for Missed rays but one is necessary for Exiting and 5a=nF9/
Incident rays. wl7 M fyU
The candela plots represent flux versus angle and can be smoothed using the L7SEswMti
Candela Options dialog box. The iso-candela plots can be presented as false wn
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color maps or contour plots. The distribution plots are graphs of cross-sectional Y.DwtfE
curves through the candela distribution. oJP< 'l1
The orientation of the candela plots is determined by the Normal Vector and the sW;7m[o
Up Vector, as specified in the Analysis|Candela Options dialog box. The ]UK`?J=t2g
normal vector specifies the axis of the candela plot and the up vector specifies h6g=$8E
“which way is up.”
