给个英文的.个人理解可能会有点出入.基本上是这个意思. *(nJX.7
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric i;]CL[#2e`
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 8m7;x/0ld
radiometric units, an intensity plot is in units of watts per steradian. Candela plots %
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are commonly used in the design of illumination systems, especially those used in >)y$mc6
the far field. l0#4Fma
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 5Hy3\_ +
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” `Sx. |`x8
the model and “go off to infinity.” Exiting rays are the collection of ray segments M8_ R
following the intersection point of a ray at a surface. Due to ray splitting, several zn^ v!:[
ray segments may contribute to the candela data for each incident ray. Incident 0BDo BR
rays are the collection of ray segments which intersect the selected surface. No *|poxT G
surface selection is required for Missed rays but one is necessary for Exiting and tQ[]Rc
Incident rays. sMX$Q45e
The candela plots represent flux versus angle and can be smoothed using the u
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Candela Options dialog box. The iso-candela plots can be presented as false Y"oDFo,
color maps or contour plots. The distribution plots are graphs of cross-sectional g8v[)o(qd
curves through the candela distribution. ZM
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The orientation of the candela plots is determined by the Normal Vector and the 6Ty 3e|do
Up Vector, as specified in the Analysis|Candela Options dialog box. The :ln/`_
normal vector specifies the axis of the candela plot and the up vector specifies UAKu_RO6S
“which way is up.”
