[R] lattice wireframe with logarithmically scaled axis?

[Dr. Meesters, Christian]

Hi,

I have some questions for the wireframe function of the lattice package. My dataset's "x-data" are sampled logarithmically and as such I would like to have a semilogarithmic 3D plot when plotting a time series. Does anyone know how to change the example in
http://addictedtor.free.fr/graphiques/sources/source_40.R
such that x or y would be logarithmically scaled?

Also, I would like to change the color scale such that it does not scale from min to max, but from min to a value below max. Is this possible? How? 

TIA,
Christian