[vtkusers] Single proxy class for a vector of vtkUnstructuredGrids

[Andrew Parker]

Does anybody have any further thoughts on this?  In particular a
lightweight version of vtkappendfilter that does not copy?

Cheers,
Andy

On 11 June 2012 13:54, Andrew Parker <andy.john.parker at googlemail.com>wrote:

> Hi,
>
> So that was exactly where I wanted to go, until I found that it was not a
> true proxy, which is fine it wasn't intended to be, but instead copies
> everything.  So I have had to delete components to save them being in
> memory twice.  It is a shame this class cannot behave as is, except only in
> a "shallow" fashion and not copy the data.  Indeed it would be also useful
> if it maintained a reference to the original data such that if I called
> Transform/modified one of the components then the original component would
> be modified too.
>
> Is any of that possible, in particular the lightweight version in terms of
> memory?
>
> Cheers,
> Andy
>
>
> On 11 June 2012 13:48, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>
>> Take a look at vtkAppendFilter.
>>
>> On Mon, Jun 11, 2012 at 4:37 AM, Andrew Parker
>> <andy.john.parker at googlemail.com> wrote:
>> > Hi,
>> >
>> > I have several vtkUnstructuredGrid(s) that I read in from disk, they are
>> > separate components of a large model.  For various reasons I'd like to
>> be
>> > able to keep them separate but, for the majority of my program proxy
>> them
>> > all by one interface as one single "glued" object of that type, in this
>> case
>> > a single vtkUnstructuredGrid.  For example, if I have a file that I
>> read in
>> > for a nut, and a second file for a bolt, I would like them to remain
>> > separate, but pass around an object that allowed me to do, say
>> GetPoints(),
>> > on a single vtkUnstructuredGrid object that gave me all the points in
>> both
>> > the nut and bolt meshes.  Actually, I would like to in a sense have the
>> > whole interface for vtkUnstructuredGrid and anything beneath it, but
>> behind
>> > hold a vector of vtkUnstructuredGrids, or indeed another type,
>> vtkpolydata
>> > for example.
>> >
>> > Is this possible?  I do not think the vtkMultiBlock... is what I want.
>> >  Alternatively, if this is not possible, is there anything that will
>> allow
>> > me to "add" using operator+ for example the nut and bolt together to
>> get a
>> > single mesh back.  This is not really what I want but would suffice.
>> >
>> > I would much prefer the former, but the latter is fine if the former is
>> not
>> > possible.
>> >
>> > Any help much appreciated.  Again, primary importance is one interface
>> that
>> > under the hood is a vector of said types, where that type need not be a
>> > vtkunstructuredGrid, but that would be ideal initially....
>> >
>> > Cheers again,
>> > Andy
>> >
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>>
>> --
>> Unpaid intern in BillsBasement at noware dot com
>>
>
>
>
> --
>
> __________________________________
>
>    Dr Andrew Parker
>
>    Em at il:  andrew.parker at cantab.net
>
>


-- 

__________________________________

   Dr Andrew Parker

   Em at il:  andrew.parker at cantab.net
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