给个英文的.个人理解可能会有点出入.基本上是这个意思. /g!X[rn7Q
JP]-a!5Ru
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 461p 4)
units, a luminous intensity plot is in units of candelas (lumens per steradian). In o%h[o9i
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Xx^v%[!`+
are commonly used in the design of illumination systems, especially those used in ZC D Xy
the far field. I=k`VI d:
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Ujvk*~:
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Qs 'dwc
the model and “go off to infinity.” Exiting rays are the collection of ray segments WmblY2
following the intersection point of a ray at a surface. Due to ray splitting, several j ^Ln\N]^
ray segments may contribute to the candela data for each incident ray. Incident d81[hT}q
rays are the collection of ray segments which intersect the selected surface. No Ft @ZK!'@
surface selection is required for Missed rays but one is necessary for Exiting and c}2"X,
Incident rays. u}jC$T>2%6
The candela plots represent flux versus angle and can be smoothed using the q=k[] vD
Candela Options dialog box. The iso-candela plots can be presented as false ?u{D-by%&
color maps or contour plots. The distribution plots are graphs of cross-sectional Eq5X/Hx
curves through the candela distribution. raZ0B,;eFu
The orientation of the candela plots is determined by the Normal Vector and the De49!{\a
Up Vector, as specified in the Analysis|Candela Options dialog box. The n&E/{o(
normal vector specifies the axis of the candela plot and the up vector specifies GJB MaT
“which way is up.”
