给个英文的.个人理解可能会有点出入.基本上是这个意思. tP; &$y. 8
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric &qw7BuF
units, a luminous intensity plot is in units of candelas (lumens per steradian). In F) w.q
radiometric units, an intensity plot is in units of watts per steradian. Candela plots @L^Fz$Sx
are commonly used in the design of illumination systems, especially those used in Ynnp gR.
the far field. l ;i,V;@ t
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface _&S?uz m
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” TDI8L\rr
the model and “go off to infinity.” Exiting rays are the collection of ray segments p- 5)J&
following the intersection point of a ray at a surface. Due to ray splitting, several JA W}]:jC
ray segments may contribute to the candela data for each incident ray. Incident &`>[4D*
rays are the collection of ray segments which intersect the selected surface. No }~P%S( zB
surface selection is required for Missed rays but one is necessary for Exiting and kp3(/`xP
Incident rays. |8I #`
The candela plots represent flux versus angle and can be smoothed using the V:F;Nq%+j
Candela Options dialog box. The iso-candela plots can be presented as false (;u tiupW
color maps or contour plots. The distribution plots are graphs of cross-sectional [6x-c;H_4
curves through the candela distribution. KT n,}7vZ
The orientation of the candela plots is determined by the Normal Vector and the w:Ui_-4*>
Up Vector, as specified in the Analysis|Candela Options dialog box. The 1-Fg_G}|6
normal vector specifies the axis of the candela plot and the up vector specifies \ )'nxFKqV
“which way is up.”
