给个英文的.个人理解可能会有点出入.基本上是这个意思. >m1b/J3#
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric LsIZeL^
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ]3*w3Y!XK
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 5 cQ]vb
are commonly used in the design of illumination systems, especially those used in }[PwA[k'
the far field. gE @Pb
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface )hO%W|
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” a-,*iK{_u
the model and “go off to infinity.” Exiting rays are the collection of ray segments 3Q62H+MC
following the intersection point of a ray at a surface. Due to ray splitting, several H9TeMY
ray segments may contribute to the candela data for each incident ray. Incident !] uB4
rays are the collection of ray segments which intersect the selected surface. No ,{q#U3
surface selection is required for Missed rays but one is necessary for Exiting and )#\3c,<Y
Incident rays. 2RNee@!JJP
The candela plots represent flux versus angle and can be smoothed using the 2Q@n a @s
Candela Options dialog box. The iso-candela plots can be presented as false [O_5`X9|
color maps or contour plots. The distribution plots are graphs of cross-sectional 6<S-o|Xw
curves through the candela distribution. 6q>iPK Jt
The orientation of the candela plots is determined by the Normal Vector and the $04lL/;
Up Vector, as specified in the Analysis|Candela Options dialog box. The }15&<s
normal vector specifies the axis of the candela plot and the up vector specifies b1IAp >*2l
“which way is up.”
