From: Ondrej Marsalek (
Date: Mon Nov 24 2008 - 11:09:35 CST


thanks for the info. Using molecules means somewhat more work, as one
has to switch molecules on and off (and transfer representations)
instead of just changing the volumetric data set, as these are not
visible between molecules. However, it should be possible. I know
about the multi-molecule extension, i guess i will have to do
something similar.


On Mon, Nov 24, 2008 at 17:32, John Stone <> wrote:
> Ondrej,
> The existing versions of VMD will not allow you to individually
> delete volumetric datasets from within a molecule. I will soon be
> rewriting much of the volumetric data infrastructure in VMD, and this
> is one of the items that is high on my list to address. In the mean time,
> adding the volume data to a new molecule and subsequently deleting the
> molecule are the short-term solution to this problem.
> Cheers,
> John Stone
> On Mon, Nov 24, 2008 at 05:18:39PM +0100, Ondrej Marsalek wrote:
>> dear vmd users and developers,
>> i would like to create animations of volumetric data in vmd. so far, i
>> have a script that loads all the data (form cube files) and uses trace
>> so that the representation gets updated on frame change. this works
>> fine but it is limited in the number of frames (of certain data size)
>> that it can process.
>> therefore, i would like to implement some simple caching mechanism. i
>> thought that would be straightforward, but then i failed to find a way
>> to remove volumetric data from a molecule. frames can be removed and
>> whole molecules can be removed. is it really true that vmd does not
>> have any way of getting rid of volumetric data (short of deleting the
>> whole moecule) or have i missed something?
>> thanks,
>> ondrej marsalek
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