给个英文的.个人理解可能会有点出入.基本上是这个意思. )rj!/%
Tb?X KO,
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric [9Rh" H; h
units, a luminous intensity plot is in units of candelas (lumens per steradian). In )z74,n7-
radiometric units, an intensity plot is in units of watts per steradian. Candela plots t!/~_}eD J
are commonly used in the design of illumination systems, especially those used in k`N*_/(|n
the far field. 4To$!=
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface T?!SEblP]
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” WR#h~N
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the model and “go off to infinity.” Exiting rays are the collection of ray segments OQ_< V xz
following the intersection point of a ray at a surface. Due to ray splitting, several Qf y_@w]
ray segments may contribute to the candela data for each incident ray. Incident 2D"my]FnF
rays are the collection of ray segments which intersect the selected surface. No urx?p ^c
surface selection is required for Missed rays but one is necessary for Exiting and eF{uWus
Incident rays. ~b)X:ku
The candela plots represent flux versus angle and can be smoothed using the `^8mGR>OpI
Candela Options dialog box. The iso-candela plots can be presented as false w2'z~\dG8
color maps or contour plots. The distribution plots are graphs of cross-sectional WK*tXc_[b
curves through the candela distribution. hkb\ GcOj
The orientation of the candela plots is determined by the Normal Vector and the PP'5ANK
Up Vector, as specified in the Analysis|Candela Options dialog box. The jmv=rl>E*
normal vector specifies the axis of the candela plot and the up vector specifies [3-u7Fx!
“which way is up.”
