给个英文的.个人理解可能会有点出入.基本上是这个意思. Eh)PZvH
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric E
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In p ] V
radiometric units, an intensity plot is in units of watts per steradian. Candela plots J ?~El&
are commonly used in the design of illumination systems, especially those used in kqfO3{-;{:
the far field. Yp1;5B bp
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface I]|X6
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” "RH pj3 si
the model and “go off to infinity.” Exiting rays are the collection of ray segments Pvq74?an`
following the intersection point of a ray at a surface. Due to ray splitting, several 9"3 7va
ray segments may contribute to the candela data for each incident ray. Incident db%o3>>e
rays are the collection of ray segments which intersect the selected surface. No w]hs1vch
surface selection is required for Missed rays but one is necessary for Exiting and ao]Dm#HiO
Incident rays. |#); ^z_
The candela plots represent flux versus angle and can be smoothed using the 0Z{f! MOh
Candela Options dialog box. The iso-candela plots can be presented as false ?H \K];
color maps or contour plots. The distribution plots are graphs of cross-sectional RG9YA&1ce
curves through the candela distribution. }]ak6'|[
The orientation of the candela plots is determined by the Normal Vector and the "/e:V-W
Up Vector, as specified in the Analysis|Candela Options dialog box. The )A}u)PH4O
normal vector specifies the axis of the candela plot and the up vector specifies x roo_
“which way is up.”
