> RasTop is an open source RasMol derived molecular visualisation
> program for windows which allows to work with multiple molecular
> models.
> In RasTop there is a selector for working with the "universe" or with
> specific models.
> The "universe" is the entire display scene i.e. all the molecular
> models loaded.
> When a new file is loaded, the model is displayed at the center of the
> universe. You can then translate or rotate it independantly from the
> universe or, by selecting the universe, move the entire universe.

Paul,

Thanks for posting this.

I will get RasTop installed on a Win32 machine and take a look at this.

What you are saying makes sense, but I need to understand it step by step.

First, be advised that there are some areas of RasMol that I am not
familiar with.

Second, Jmol does not handle a change to the 'center of rotation' in the
same way that RasMol does. In Jmol, when a new center of rotation is
defined then it is shifted to the center of the window.

Take me through this step-by-step in RasTop:

I load molecule A. The average point is used as centerA. Coordinates are
transformed so that centerA is mapped to the center of the display window.

I assume that centerA is also the 'center of the universe'

I know load molecule B. Is has its own average point, centerB. I assume
that centerB is translated in 3D so that it overlaps centerA.

Is this correct?


Miguel



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