给个英文的.个人理解可能会有点出入.基本上是这个意思. p;D
{?H/
CL?=j| Ea
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric RMid}BRE
units, a luminous intensity plot is in units of candelas (lumens per steradian). In b `}hw"f
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 83aWMmA(1
are commonly used in the design of illumination systems, especially those used in CHj m7
the far field. (h[.
Ie
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface y@AUSh;
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” lS!O(NzqE'
the model and “go off to infinity.” Exiting rays are the collection of ray segments j0n.+CO-{
following the intersection point of a ray at a surface. Due to ray splitting, several A!uiM*"W
ray segments may contribute to the candela data for each incident ray. Incident IJ :J H=8
rays are the collection of ray segments which intersect the selected surface. No O*n@!ye
surface selection is required for Missed rays but one is necessary for Exiting and +CXq41g"c
Incident rays. nQg_1+
The candela plots represent flux versus angle and can be smoothed using the M~y}0Ik
Candela Options dialog box. The iso-candela plots can be presented as false v0bP|h [t
color maps or contour plots. The distribution plots are graphs of cross-sectional RXu` DWN
curves through the candela distribution. ;
0M"T[c
The orientation of the candela plots is determined by the Normal Vector and the 6TXTJ]er
Up Vector, as specified in the Analysis|Candela Options dialog box. The FF|M7/[~
normal vector specifies the axis of the candela plot and the up vector specifies 2r ]o>X
“which way is up.”
