给个英文的.个人理解可能会有点出入.基本上是这个意思. ^KU:5Bn
8?GS :+
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ,KlTitJl\+
units, a luminous intensity plot is in units of candelas (lumens per steradian). In h^P>,dy0
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 7 4 c1 i
are commonly used in the design of illumination systems, especially those used in 9})!~r;|
the far field. }57 w E$9K
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface S8O^^jJq;
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ` L(AvSR
the model and “go off to infinity.” Exiting rays are the collection of ray segments Vrf+ ~KO7
following the intersection point of a ray at a surface. Due to ray splitting, several +e0]Y8J{
ray segments may contribute to the candela data for each incident ray. Incident e&C(IEZ/N;
rays are the collection of ray segments which intersect the selected surface. No 7@MGs2
surface selection is required for Missed rays but one is necessary for Exiting and <qzHMy Ai
Incident rays. [?<"SJ ,`
The candela plots represent flux versus angle and can be smoothed using the # E'g{.N
Candela Options dialog box. The iso-candela plots can be presented as false *f~X wy"
color maps or contour plots. The distribution plots are graphs of cross-sectional @L%9NqE`O
curves through the candela distribution. _C v({m&N
The orientation of the candela plots is determined by the Normal Vector and the //G5lW/*
Up Vector, as specified in the Analysis|Candela Options dialog box. The +igFIoHTM
normal vector specifies the axis of the candela plot and the up vector specifies xo0",i
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“which way is up.”
