给个英文的.个人理解可能会有点出入.基本上是这个意思. tXnD>H YV
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric G8_|w6
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 9 ~$' ?
radiometric units, an intensity plot is in units of watts per steradian. Candela plots F%>`?NG+c
are commonly used in the design of illumination systems, especially those used in VCUEz R0
the far field. \4|o5, +(@
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Rc k k
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” eC41PQ3=1'
the model and “go off to infinity.” Exiting rays are the collection of ray segments >
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following the intersection point of a ray at a surface. Due to ray splitting, several z wJ Vi9sO
ray segments may contribute to the candela data for each incident ray. Incident LdM9k(
rays are the collection of ray segments which intersect the selected surface. No w*"h#^1z
surface selection is required for Missed rays but one is necessary for Exiting and JgY#W1>
Incident rays. L@HWm;aN
The candela plots represent flux versus angle and can be smoothed using the
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Candela Options dialog box. The iso-candela plots can be presented as false csay\Q{
color maps or contour plots. The distribution plots are graphs of cross-sectional 1#<KZN =$
curves through the candela distribution. S
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The orientation of the candela plots is determined by the Normal Vector and the Xi!`+N4
Up Vector, as specified in the Analysis|Candela Options dialog box. The VDP \E<3"
normal vector specifies the axis of the candela plot and the up vector specifies 5?n@.h c L
“which way is up.”
