给个英文的.个人理解可能会有点出入.基本上是这个意思. 4^*Z[6nt|
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ~iIFe+6
units, a luminous intensity plot is in units of candelas (lumens per steradian). In VrKLEN\
radiometric units, an intensity plot is in units of watts per steradian. Candela plots W6)XMl}n
are commonly used in the design of illumination systems, especially those used in 5! ]T%.rM
the far field. uG/b Cb+V
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface DG=_E\"#
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” vo s-[$
the model and “go off to infinity.” Exiting rays are the collection of ray segments a ~k* Gd(
following the intersection point of a ray at a surface. Due to ray splitting, several >J,I xRGi
ray segments may contribute to the candela data for each incident ray. Incident 3!Mb<W.3
rays are the collection of ray segments which intersect the selected surface. No :4>LtfA
surface selection is required for Missed rays but one is necessary for Exiting and Pk8(2fAYk
Incident rays. 6|Crc$4l
The candela plots represent flux versus angle and can be smoothed using the QZ5%nJme_
Candela Options dialog box. The iso-candela plots can be presented as false EkOn Rm_hn
color maps or contour plots. The distribution plots are graphs of cross-sectional Q@TeU#2Y
curves through the candela distribution. /AIFgsaY
The orientation of the candela plots is determined by the Normal Vector and the e63io0g>
Up Vector, as specified in the Analysis|Candela Options dialog box. The 4)9Pgp :
normal vector specifies the axis of the candela plot and the up vector specifies tbB.n
“which way is up.”
