给个英文的.个人理解可能会有点出入.基本上是这个意思. M5kHD]b
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 5?L:8kHsH
units, a luminous intensity plot is in units of candelas (lumens per steradian). In HoE.//b
radiometric units, an intensity plot is in units of watts per steradian. Candela plots kQd[E-b7
are commonly used in the design of illumination systems, especially those used in &NjZD4m`=
the far field. 1IQOl
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface @Q\$dneY
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” /v)! m&6]>
the model and “go off to infinity.” Exiting rays are the collection of ray segments q>(u>z!
following the intersection point of a ray at a surface. Due to ray splitting, several Q(5:~**I
ray segments may contribute to the candela data for each incident ray. Incident o>;0NF| }
rays are the collection of ray segments which intersect the selected surface. No bNjaCK<
surface selection is required for Missed rays but one is necessary for Exiting and Zmbz-##HQ
Incident rays. ~wf~b zs
The candela plots represent flux versus angle and can be smoothed using the T 0v@mXBQ
Candela Options dialog box. The iso-candela plots can be presented as false ~oA9+mT5
color maps or contour plots. The distribution plots are graphs of cross-sectional 11<@++,i
curves through the candela distribution. PnIvk]"Ab
The orientation of the candela plots is determined by the Normal Vector and the +'j*WVE%5
Up Vector, as specified in the Analysis|Candela Options dialog box. The ^xw [d}0 S
normal vector specifies the axis of the candela plot and the up vector specifies q\t>D
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“which way is up.”
