[Paraview] Good/Possible/Bad idea? Use Camera matrix to Exaggerate Z Scale

[Sean Ziegeler]

We see a similar thing in ocean/atmospheric data.  X & Y is in a 
different coordinate system than Z (e.g., lon/lat degrees vs. meters 
respectively), and thus must be scaled to be viewed properly.

My solution is to use the Transform Filter when possible to scale the Z 
axis.  The advantage is that you don't have to set the scale matrix for 
every actor; the transformed coordinates are passed to every downstream 
filter.  The disadvantage is that the true coordinates are no longer 
available if needed, for example, if you turn on axis labeling, or do 
computations that require the true coordinates.

Also, in some cases, the Transform filter is not available, for 
rectilinear data, for example.  I use a Programmable filter for those 
cases, but the above issues still apply.

IMO, for ocean/atmospheric data, it would be handy to support separate 
display and computation coordinates.  It sounds like your data would 
have the same requirement.  One way would be some process/filter that 
modifies all downstream actors.  In any case, I can't think of a way to 
do it that isn't time consuming, and I've given it a good bit of 
thought.  If someone else has a better idea, I'd be all ears.

Thanks,
Sean

On 08/08/11 13:09, Lawrence Angrave wrote:
> Hi,
>
> We're using Paraview to display data which is very thin in the Z
> direction compare to X,Y size. We'd like to artificially exaggerate the
> display in the Z direction.
>
> One tedious way to do this is to set the scale matrix for every object.
> e.g. Scale the Z coordinates by 30.
>
> An alternative approach would be to set a camera transform to include a
> scaling in the world coordinate system, e.g. (1,1,30). Is this
> configurable in the Paraview GUI / settable via python/ or even possible
> without artefacts and unwanted side-effects?
>
> Thanks in advance,
>
> Lawrence.
>
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