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 mSzh
h:bs/q+-
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric fil6w</L
units, a luminous intensity plot is in units of candelas (lumens per steradian). In &KR@2~vE
radiometric units, an intensity plot is in units of watts per steradian. Candela plots t 1C{
are commonly used in the design of illumination systems, especially those used in nj7Ri=lyS
the far field. Cc Ni8Wg_
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ;o^m"I\y
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Bl`e+&b
the model and “go off to infinity.” Exiting rays are the collection of ray segments g 1zqh,
following the intersection point of a ray at a surface. Due to ray splitting, several RB &s$6A
ray segments may contribute to the candela data for each incident ray. Incident ^ *
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rays are the collection of ray segments which intersect the selected surface. No ui 2RTAb
surface selection is required for Missed rays but one is necessary for Exiting and UO:>^,(j
Incident rays. 1~7y]d?%
The candela plots represent flux versus angle and can be smoothed using the yAi4v[
Candela Options dialog box. The iso-candela plots can be presented as false =?*V3e3{
color maps or contour plots. The distribution plots are graphs of cross-sectional q6_1`Ew
curves through the candela distribution. t&r?O dc&m
The orientation of the candela plots is determined by the Normal Vector and the ' .kbXw0}
Up Vector, as specified in the Analysis|Candela Options dialog box. The aO<d`DTyJ
normal vector specifies the axis of the candela plot and the up vector specifies &R^mpV5
“which way is up.”
