给个英文的.个人理解可能会有点出入.基本上是这个意思. gm\o>YclS
3f.Gog
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Am` A[rV0
units, a luminous intensity plot is in units of candelas (lumens per steradian). In )B5gs%u]
radiometric units, an intensity plot is in units of watts per steradian. Candela plots
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are commonly used in the design of illumination systems, especially those used in b 0x0CMf
the far field. %oKc?'L0
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface V +<AG*[
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” {-]HYk
the model and “go off to infinity.” Exiting rays are the collection of ray segments d"`>&8*
following the intersection point of a ray at a surface. Due to ray splitting, several v2X0Px_
ray segments may contribute to the candela data for each incident ray. Incident _*B~ESC0
rays are the collection of ray segments which intersect the selected surface. No Lj* =*V
surface selection is required for Missed rays but one is necessary for Exiting and (GOrfr
Incident rays. kI Tmo"$K
The candela plots represent flux versus angle and can be smoothed using the S aq>o.
Candela Options dialog box. The iso-candela plots can be presented as false v2=!*
color maps or contour plots. The distribution plots are graphs of cross-sectional J9t? ]9.,:
curves through the candela distribution. yacGJz^f=
The orientation of the candela plots is determined by the Normal Vector and the ^dKaa
Up Vector, as specified in the Analysis|Candela Options dialog box. The UNLNY,P/!)
normal vector specifies the axis of the candela plot and the up vector specifies v 5ddb)
“which way is up.”
