[Paraview] GMT grids to 3D surface

[Lester Anderson]

Reloading the GMT grid and not selecting spherical coordinates will "trick"
it to work the warp, but recognises the dimensions as lat-long. In other
words, applying a flat earth model works!

So I guess the question that arises is, how do you do warping (exagerated
elevations) on a sphere?

Cheers
Lester

On 25 February 2015 at 22:39, Lester Anderson <arctica1963 at gmail.com> wrote:

> Hello,
>
> I rechecked the GMT grids and the Warp by Scalar only seems to work on
> some data (if the reference frame is cartesian), but not with
> longitude-latitude grids. I checked both the classic GMT netCDF format (cf)
> and the new format (nf) and although there is no problem loading the data,
> the warp by scalar is greyed out.
>
> I generated a topo grid from Sandwell & Smith (area = 10/10/-10/10) at 1
> arc minute cell size and it loads as a structured (curvilinear) grid. The Z
> values are correct for the bathymetry and topography. In this case, the
> surface is curved as expected for a section on the sphere, so maybe that is
> why the warp by scalar is not available?
>
> The file I got to work before was a simple flat surface in cartesian
> units. This grid was defined as an image (uniform rectilinear grid) before
> the warp was applied.
>
> Still not sure about this one.
>
> Lester
>
> On 25 February 2015 at 19:35, Lester Anderson <arctica1963 at gmail.com>
> wrote:
>
>> Thanks Utkarsh, that solved the issue fine :)
>>
>> Cheers
>> Lester
>>
>> On 25 February 2015 at 14:17, Utkarsh Ayachit <
>> utkarsh.ayachit at kitware.com> wrote:
>>
>>> Have you tried the "Warp By Scalar" filter? The filter allows you to
>>> select the scalar to warp with as well as the normal along which to
>>> warp the mesh.
>>>
>>> Utkarsh
>>>
>>> On Tue, Feb 24, 2015 at 5:37 AM, Lester Anderson <arctica1963 at gmail.com>
>>> wrote:
>>> > Hello,
>>> >
>>> > I can see how to load a GMT (netCDF) grid into Paraview but cannot
>>> seem to
>>> > see how to translate it into an elevation surface.
>>> >
>>> > The data is a gridded surface of a subducting slab geometry, with X, Y
>>> as
>>> > longitude and latitude respectively, and Z as the depth range 0 to
>>> -700 km.
>>> > Here the Z value represents the scalar depth.
>>> >
>>> > Do I need to pre-process the data prior to loading into Paraview? When
>>> > loaded the Z-dimension is 1 so it is still essentially a 2D surface.
>>> Loading
>>> > point data (eg earthquake solutions) is fine as I can edit the data
>>> table,
>>> > but not sure what else I need to get a slab surface in correctly: for
>>> > plotting the Z-dimension would need to have an extent of 0 to 699
>>> (d=700).
>>> >
>>> > Be good to know how I can solve this simply.
>>> >
>>> > Cheers
>>> >
>>> > Lester
>>> >
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