给个英文的.个人理解可能会有点出入.基本上是这个意思. W" "*ASi
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 1x J
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In Ey{%XR +*;
radiometric units, an intensity plot is in units of watts per steradian. Candela plots v
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are commonly used in the design of illumination systems, especially those used in Bc-yxjsw
the far field. B-.v0R`5
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface u]^N&2UW
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Nb2Qp
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the model and “go off to infinity.” Exiting rays are the collection of ray segments UnDgu4#R`A
following the intersection point of a ray at a surface. Due to ray splitting, several (oK^c- x
ray segments may contribute to the candela data for each incident ray. Incident 5M]z5}n/
rays are the collection of ray segments which intersect the selected surface. No C.:=lo B
surface selection is required for Missed rays but one is necessary for Exiting and _zxLwU1(x
Incident rays. pb60R| k
The candela plots represent flux versus angle and can be smoothed using the C9n}6Er=,
Candela Options dialog box. The iso-candela plots can be presented as false 8?t"C_>*e
color maps or contour plots. The distribution plots are graphs of cross-sectional t-u|U(n
curves through the candela distribution. 3LR p2(A
The orientation of the candela plots is determined by the Normal Vector and the d<w~jP\
Up Vector, as specified in the Analysis|Candela Options dialog box. The nm$Dd~mxW1
normal vector specifies the axis of the candela plot and the up vector specifies 7fp(R&)1
“which way is up.”
