给个英文的.个人理解可能会有点出入.基本上是这个意思. M<PIeKIEB
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric \!]hU%Un
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 7nq 3S
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Iq7}
are commonly used in the design of illumination systems, especially those used in M=qb^~ l
the far field. }~K`/kvs
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface \b=Pj!^gwb
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” WI> P-D
the model and “go off to infinity.” Exiting rays are the collection of ray segments .iMN ,+qP
following the intersection point of a ray at a surface. Due to ray splitting, several $j}OB6^I
ray segments may contribute to the candela data for each incident ray. Incident j^tW
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rays are the collection of ray segments which intersect the selected surface. No 2 dp>Z",
surface selection is required for Missed rays but one is necessary for Exiting and :r #)z4d5
Incident rays. B.r4$:+jb2
The candela plots represent flux versus angle and can be smoothed using the uDw.|B2ui
Candela Options dialog box. The iso-candela plots can be presented as false l KWPTCU
color maps or contour plots. The distribution plots are graphs of cross-sectional ".^VI2T
curves through the candela distribution. 8K(Z0
The orientation of the candela plots is determined by the Normal Vector and the zm j"fN{\
Up Vector, as specified in the Analysis|Candela Options dialog box. The &8.NT~"Gg
normal vector specifies the axis of the candela plot and the up vector specifies k3?rp`V1
“which way is up.”
