给个英文的.个人理解可能会有点出入.基本上是这个意思. 4E
| 6l
z}bnw2d]
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric z{#F9'\ &
units, a luminous intensity plot is in units of candelas (lumens per steradian). In >>$IHz4Z"
radiometric units, an intensity plot is in units of watts per steradian. Candela plots b=|&0B$E
are commonly used in the design of illumination systems, especially those used in :LBe{ Jbw
the far field. ^ 2kWD8c*
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface (u G4W|?p
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” xD\Km> |i
the model and “go off to infinity.” Exiting rays are the collection of ray segments @5?T]V g
following the intersection point of a ray at a surface. Due to ray splitting, several rIb[gm)Rk
ray segments may contribute to the candela data for each incident ray. Incident z)VIbEy
rays are the collection of ray segments which intersect the selected surface. No =( n'#mV
surface selection is required for Missed rays but one is necessary for Exiting and z t,-O7I'1
Incident rays. =H,cwSE+%
The candela plots represent flux versus angle and can be smoothed using the Ar<OP'C
Candela Options dialog box. The iso-candela plots can be presented as false K%pmE?%,8
color maps or contour plots. The distribution plots are graphs of cross-sectional oy r2lfz*
curves through the candela distribution. HJJ ^pk&
The orientation of the candela plots is determined by the Normal Vector and the >|Jw ,,uf
Up Vector, as specified in the Analysis|Candela Options dialog box. The 3,vH:L4
normal vector specifies the axis of the candela plot and the up vector specifies `90v~O F
“which way is up.”
