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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric _w <6o<@
units, a luminous intensity plot is in units of candelas (lumens per steradian). In G!F_Q7|-
radiometric units, an intensity plot is in units of watts per steradian. Candela plots nH?#_ 5F1
are commonly used in the design of illumination systems, especially those used in ? R[GSS1
the far field. sx[mbKj<
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 7O=7lQ
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” SrdCLT8
the model and “go off to infinity.” Exiting rays are the collection of ray segments `ST;";7!
following the intersection point of a ray at a surface. Due to ray splitting, several 9-=kVmT&g
ray segments may contribute to the candela data for each incident ray. Incident ]xV2=!J
rays are the collection of ray segments which intersect the selected surface. No zU|'IW&
surface selection is required for Missed rays but one is necessary for Exiting and vHymSU/J
Incident rays. rUB67ok*
The candela plots represent flux versus angle and can be smoothed using the ZOJ7^g
Candela Options dialog box. The iso-candela plots can be presented as false bC&xN@4
color maps or contour plots. The distribution plots are graphs of cross-sectional XS0NjZW
curves through the candela distribution. pug;1UZ
The orientation of the candela plots is determined by the Normal Vector and the 2-duzc
Up Vector, as specified in the Analysis|Candela Options dialog box. The u69G
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normal vector specifies the axis of the candela plot and the up vector specifies unN*L
“which way is up.”