给个英文的.个人理解可能会有点出入.基本上是这个意思. VP=(",`
WM BntB
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric {
'Hi_ b3
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 35Nwx<
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 5gW`;Cdbyc
are commonly used in the design of illumination systems, especially those used in xEaRuH c
the far field. ~u1ox_v`%(
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 8 Q^yh6z
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ';??0M
the model and “go off to infinity.” Exiting rays are the collection of ray segments 12Qcjj%F*
following the intersection point of a ray at a surface. Due to ray splitting, several boo,KhW'Y
ray segments may contribute to the candela data for each incident ray. Incident !cw<C*
rays are the collection of ray segments which intersect the selected surface. No _Jj/"?
surface selection is required for Missed rays but one is necessary for Exiting and [8.ufpZ
Incident rays. zvL&V
.>
The candela plots represent flux versus angle and can be smoothed using the =25q Y"Mf
Candela Options dialog box. The iso-candela plots can be presented as false vP&dvAUF
color maps or contour plots. The distribution plots are graphs of cross-sectional @Fqh]1t
curves through the candela distribution. ]CH@ T9d5V
The orientation of the candela plots is determined by the Normal Vector and the {rGq|Bj
Up Vector, as specified in the Analysis|Candela Options dialog box. The > ZkcL7t9
normal vector specifies the axis of the candela plot and the up vector specifies XETY)<g
“which way is up.”
