给个英文的.个人理解可能会有点出入.基本上是这个意思. 1 s@QsZ3
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric #@OPi6.#!<
units, a luminous intensity plot is in units of candelas (lumens per steradian). In OqIXFX"
radiometric units, an intensity plot is in units of watts per steradian. Candela plots mi<Q3;m
are commonly used in the design of illumination systems, especially those used in "r_wgl%
the far field. o
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface {eI '0==
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 64mEZ_kG,
the model and “go off to infinity.” Exiting rays are the collection of ray segments r9&m^ ,U
following the intersection point of a ray at a surface. Due to ray splitting, several I/tMFg
ray segments may contribute to the candela data for each incident ray. Incident vs=q< Uw)
rays are the collection of ray segments which intersect the selected surface. No Rr %x;-
surface selection is required for Missed rays but one is necessary for Exiting and i (;`x
Incident rays. YIg43Av
The candela plots represent flux versus angle and can be smoothed using the El5} f4sl
Candela Options dialog box. The iso-candela plots can be presented as false ;j/$%lC
color maps or contour plots. The distribution plots are graphs of cross-sectional eIalcBY
curves through the candela distribution. S Dil\x
The orientation of the candela plots is determined by the Normal Vector and the |mQ Fi\
Up Vector, as specified in the Analysis|Candela Options dialog box. The a24 AmoWx
normal vector specifies the axis of the candela plot and the up vector specifies uStAZ ~b\
“which way is up.”
