(required) Measurement in screen pixels that represents the minimum
limit of the visibility range for a given Region. Google Earth calculates the size
of the Region when projected onto screen space. Then it computes the square root
of the Region's area (if, for example, the Region is square and the viewpoint is
directly above the Region, and the Region is not tilted, this measurement is equal
to the width of the projected Region). If this measurement falls within the limits
defined by and (and if the is in view),
the Region is active. If this limit is not reached, the associated geometry is considered
to be too far from the user's viewpoint to be drawn. Measurement
in screen pixels that represents the maximum limit of the visibility range for a
given Region. A value of −1, the default, indicates "active to infinite size."
Distance over which the geometry fades, from fully opaque to fully transparent.
This ramp value, expressed in screen pixels, is applied at the minimum end of the
LOD (visibility) limits. Distance over which the geometry fades,
from fully transparent to fully opaque. This ramp value, expressed in screen pixels,
is applied at the maximum end of the LOD (visibility) limits.
Measurement in screen pixels that represents the minimum limit of the visibility
range for a given Region. Google Earth calculates the size of the Region when projected
onto screen space. Then it computes the square root of the Region's area (if, for
example, the Region is square and the viewpoint is directly above the Region, and
the Region is not tilted, this measurement is equal to the width of the projected
Region). If this measurement falls within the limits defined by and
(and if the is in view), the Region is active. If
this limit is not reached, the associated geometry is considered to be too far from
the user's viewpoint to be drawn.
maxLodPixels
protected double maxLodPixels
Measurement in screen pixels that represents the maximum limit of the visibility
range for a given Region. A value of −1, the default, indicates "active to infinite
size."
minFadeExtent
protected double minFadeExtent
Distance over which the geometry fades, from fully opaque to fully transparent.
This ramp value, expressed in screen pixels, is applied at the minimum end of the
LOD (visibility) limits.
maxFadeExtent
protected double maxFadeExtent
Distance over which the geometry fades, from fully transparent to fully opaque.
This ramp value, expressed in screen pixels, is applied at the maximum end of the
LOD (visibility) limits.
In the following diagram, if P=the calculated projected pixel size, the circled
numbers indicate the following: if (P < minLodPixels) opacity=0 //#1 in diagram
else if(P < minLodPixels + minFadeExtent) opacity=(P - minLodPixels)/minFadeExtent
//#2 in diagram else if (P < maxLodPixels - maxFadeExtent) opacity=1 //#3 in diagram
else if (P < maxLodPixels) opacity=(maxLodPixels-P)/maxFadeExtent //#4 in diagram
else opacity=0 //#5 in diagram