给个英文的.个人理解可能会有点出入.基本上是这个意思. :uQ~?amM
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 65AG#O5R
units, a luminous intensity plot is in units of candelas (lumens per steradian). In D>m!R[!o
radiometric units, an intensity plot is in units of watts per steradian. Candela plots {/K_NSg+h
are commonly used in the design of illumination systems, especially those used in y)D7!s
the far field. oa:30@HSb
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Qv/Kb w
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” \zv?r:1t
the model and “go off to infinity.” Exiting rays are the collection of ray segments @ !m+s~~]h
following the intersection point of a ray at a surface. Due to ray splitting, several p}9bZKyf
ray segments may contribute to the candela data for each incident ray. Incident \%$z!]S>
rays are the collection of ray segments which intersect the selected surface. No HRF;qR9v
surface selection is required for Missed rays but one is necessary for Exiting and /d-d8n
Incident rays. h+d3 JM
The candela plots represent flux versus angle and can be smoothed using the
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Candela Options dialog box. The iso-candela plots can be presented as false pqnZ:'V
color maps or contour plots. The distribution plots are graphs of cross-sectional CI~ll=9`
curves through the candela distribution. ]}HuK#
The orientation of the candela plots is determined by the Normal Vector and the =x^b
Up Vector, as specified in the Analysis|Candela Options dialog box. The 4pC.mRu
0
normal vector specifies the axis of the candela plot and the up vector specifies <imIgt|`2
“which way is up.”