给个英文的.个人理解可能会有点出入.基本上是这个意思. g Sf > +|
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Spn)M79
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 5 0a';!H
radiometric units, an intensity plot is in units of watts per steradian. Candela plots s'OK])>`
are commonly used in the design of illumination systems, especially those used in jy_4W !4a
the far field. b5ul|p
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ux, eY
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” GkI{7GD:z
the model and “go off to infinity.” Exiting rays are the collection of ray segments ) 1$H 7|
following the intersection point of a ray at a surface. Due to ray splitting, several yo% Nz"
ray segments may contribute to the candela data for each incident ray. Incident `b%^_@Fb
rays are the collection of ray segments which intersect the selected surface. No `u_k?)lK
surface selection is required for Missed rays but one is necessary for Exiting and 'I :_}q
Incident rays. 8VuLL<\|
The candela plots represent flux versus angle and can be smoothed using the qE VpkvEq
Candela Options dialog box. The iso-candela plots can be presented as false HrMbp
color maps or contour plots. The distribution plots are graphs of cross-sectional O[z6W.
curves through the candela distribution. <GLoT olZ
The orientation of the candela plots is determined by the Normal Vector and the R <%{I)
Up Vector, as specified in the Analysis|Candela Options dialog box. The NG2 3
normal vector specifies the axis of the candela plot and the up vector specifies l3/Cj^o4
“which way is up.”
