Or you can create your buildings in several levels of detail and
use them depending on distance from camera, like:

#declare CameraPos= ...

#declare HighLODDist= ...
#declare MiddleLODDist= ...
#declare LowLODDist= ...

#declare Build1HightLOD= ....

#declare Build1MiddleLOD= ...

#declare Build1LowLOD= ...

#macro dist (....

...
#end

#declare Build1Pos= somewhere
#local pdist=dist(Build1Pos, CameraPos)

#if (pdist < HighLODDist)
  object { Build1HighLOD translate Build1Pos }
#else
  #if (pdist < MiddleLODDist)
    object { Build1MiddleLOD translate Build1Pos }
  #else
    object { Build1LowLOD translate Build1Pos }
  #end
#end


Disnel

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