给个英文的.个人理解可能会有点出入.基本上是这个意思. PXqG;o*Q*?
Uhr RB
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric iP kCuLQ}
units, a luminous intensity plot is in units of candelas (lumens per steradian). In W+/_0GgQ3
radiometric units, an intensity plot is in units of watts per steradian. Candela plots _6V1oe2
are commonly used in the design of illumination systems, especially those used in Y SB=n d_
the far field. &q@brX<,=
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface vS)>g4
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” s2<[@@@q
the model and “go off to infinity.” Exiting rays are the collection of ray segments L~^5Ez6U
following the intersection point of a ray at a surface. Due to ray splitting, several Dk>6PBl
ray segments may contribute to the candela data for each incident ray. Incident "l9aBBiu
rays are the collection of ray segments which intersect the selected surface. No 7RWgc]@?>
surface selection is required for Missed rays but one is necessary for Exiting and #\ `kg#&
Incident rays. N'WC!K.e
The candela plots represent flux versus angle and can be smoothed using the vg5_@7
Candela Options dialog box. The iso-candela plots can be presented as false RgA"`p7{
color maps or contour plots. The distribution plots are graphs of cross-sectional [61*/=gWe
curves through the candela distribution. "TJ*mN.i{}
The orientation of the candela plots is determined by the Normal Vector and the g&85L$
Up Vector, as specified in the Analysis|Candela Options dialog box. The A= 5Ebu!z
normal vector specifies the axis of the candela plot and the up vector specifies ,oh;(|=
“which way is up.”
