[modeller_usage] Using an external program to calculate an element of the energy function

Let's call F(x) the Modeller objective function, which is minimized during the simulated annealing procedure. I'd like to use an alternative function to be minimized, say:

F'(x) = F(x) + k.G(x)

where F(x) is the original function, k is an arbitrary constant and G(x) is another function which can be calculated by an external program, given an intermediate model PDB file. Is there a way to accomplish this without having to edit Modeller's code? If so, how could I write a script to do this?

Lucas

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