给个英文的.个人理解可能会有点出入.基本上是这个意思. w+ R7NFq
6<<"9mxK
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ;6Yg} L
units, a luminous intensity plot is in units of candelas (lumens per steradian). In !43 !JfD
radiometric units, an intensity plot is in units of watts per steradian. Candela plots %g}d}5s
are commonly used in the design of illumination systems, especially those used in ,M ;9|kE*
the far field. uW(-?
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ! T][c~l
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 3@Mh* \;\b
the model and “go off to infinity.” Exiting rays are the collection of ray segments 5 tQz!M
following the intersection point of a ray at a surface. Due to ray splitting, several mG j)Zrx>
ray segments may contribute to the candela data for each incident ray. Incident O*~z@"\
rays are the collection of ray segments which intersect the selected surface. No W&*&O,c
surface selection is required for Missed rays but one is necessary for Exiting and ]`|$ nU}v
Incident rays. 3T F_$bd{
The candela plots represent flux versus angle and can be smoothed using the "mW'tm 1+
Candela Options dialog box. The iso-candela plots can be presented as false )*;Tt @'y
color maps or contour plots. The distribution plots are graphs of cross-sectional B/1j4/MS
curves through the candela distribution. ]=q auf>3
The orientation of the candela plots is determined by the Normal Vector and the su1lv#
Up Vector, as specified in the Analysis|Candela Options dialog box. The w}>%E6UY
normal vector specifies the axis of the candela plot and the up vector specifies ,G t!nm_
“which way is up.”
