Hi Ben,
 there is, although it could be more direct:

1. make sure the two initial surfaces are "close" enough to begin with
2. generate img1.vti and img2.vti with vmtksurfacemodeller
3. resample img2.vti on the image grid of img1.vti using vmtkimagereslice

vmtkimagereslice -ifile img2.vti -rfile img2.vti -ofile img2_on_1.vti

At this point img1 and img2_on_1 are defined on the exact same grid. This
is quite convenient because you can for instance merge them with 
vmtkimagecompose,
etc.

Hope this helps


Luca


On Apr 19, 2012, at 8:24 PM, Berkowitz, Benjamin M wrote:

> Is there a way to keep the origin consistent between two image stacks created 
> from vmtksurfacemodeller?
> 
> Thanks,
> Ben Berkowitz
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