Hi Eike, It's best to edit the coordinate field of the extruded mesh, particularly as you probably want to use a linear transform in r so that you don't have mountains at the top of the atmosphere too. Jemma has done this, she can fill you in with the details. all the best --Colin ________________________________________ From: firedrake-bounces@imperial.ac.uk [firedrake-bounces@imperial.ac.uk] on behalf of Eike Mueller [E.Mueller@bath.ac.uk] Sent: 27 February 2015 09:01 To: firedrake Subject: [firedrake] Perturbed extruded meshes Dear firdrakers, how can I perturb an extruded mesh? I want to add 'mountains' (i.e. bumps) to my spherical icosahedral mesh, so I want to change the radius according to something like r = r(theta) = R_earth+H*exp(-0.5*theta^2/D^2) Can I do this by moving around the underlying 2d host grid and then extruding that? How can I perturb the 2d grid? Thanks a lot, Eike _______________________________________________ firedrake mailing list firedrake@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/firedrake