给个英文的.个人理解可能会有点出入.基本上是这个意思. P \<dy?nZ
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric VK\ Bjru9
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 5sJi- ^
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ngF5ywIG
are commonly used in the design of illumination systems, especially those used in z
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the far field. Q` mw2$zv
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface !u~h.DrvZ
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” n';"c;Ye)
the model and “go off to infinity.” Exiting rays are the collection of ray segments Z#7T!/28
following the intersection point of a ray at a surface. Due to ray splitting, several W+k`^A|@
ray segments may contribute to the candela data for each incident ray. Incident {!5"Y(>X
rays are the collection of ray segments which intersect the selected surface. No i*3 4/
surface selection is required for Missed rays but one is necessary for Exiting and Z-(#}(HD
Incident rays. ghvF%-."1
The candela plots represent flux versus angle and can be smoothed using the =
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Candela Options dialog box. The iso-candela plots can be presented as false ;\(Wz5Ok&J
color maps or contour plots. The distribution plots are graphs of cross-sectional 6<0-GD}M
curves through the candela distribution. VB6EM|bphl
The orientation of the candela plots is determined by the Normal Vector and the klHOAb1
Up Vector, as specified in the Analysis|Candela Options dialog box. The _4qP0LCa
normal vector specifies the axis of the candela plot and the up vector specifies , VZ;=
“which way is up.”
