Adding KeyPressEvent "r" in GUI

[John Durkin-2]

Dear vtkusers and developers,


I am trying to implement the "reset view" action that occurs when typing "r" in the vtk window.  I am using a GUI made with QT and I want this to happen after hitting a button.  Is there some way I can manually invoke a keypressevent?  Or this there some function that can do this resetting of the view?

Thanks,


John

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[Dirk Boye]

Hi John,

If you have a vtkRenderer called "renderer" (that gets rendered in your
vtkRenderWindow), call

renderer->ResetCamera();

when pressing the button.

Don't forget to render the scene again after that, else your
renderwindow won't be updated.
If you are using a QVTKWidget called "qvtkwid"
call
qvtkwid->GetRenderWindow()->Render();

Cheers,
Dirk


On 11/09/2009 07:17:40 PM, John Durkin wrote:

> Dear vtkusers and developers,
>
>
> I am trying to implement the "reset view" action that occurs when
> typing "r"
> in the vtk window.  I am using a GUI made with QT and I want this to
> happen
> after hitting a button.  Is there some way I can manually invoke a
> keypressevent?  Or this there some function that can do this
> resetting
> of
> the view?
>
> Thanks,
>
>
> John
>

------quoted attachment------

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[lucas Grijander-2]

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Hi all!

I am using vtkMarchingCubes to calculate a 3D mesh of a volume I have. Fist I initialize the filter with:

vtkMarchingCubes* iso = vtkMarchingCubes::New();

iso->SetInput(object);

iso->SetValue(0,1); // Surface #0, iso-value=1

iso->Update();

then I fill the vtkStructuredPoints. 

The problem I have is, as you can see in the pictures, when you have a close look to the trianbles (screen2) you can see duplicated triangles and vertex, and this is a huge problem for my application... I supposed vtkMarchingCubes should generate a single surface mesh... I don't know if that's the reason, but when I fill the vtkStructuredPoints I use 

scalars->InsertValue(cnt, 0) ; and scalars->InsertValue(cnt, 128) ;

I took all these from an example, I still don't know what you have to set as values, either 1 or 128... in addition the result change with this number and I'm not sure why. 

What should I use as values? and also why I have this "double" triangles mesh?

thanks!

Jaime.

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[Bill Lorensen-2]

Please provide a small, complete example. MC should not generate
duplicate points or vertices. What is the datatype of your scalars?

On Wed, Nov 11, 2009 at 10:20 AM, lucas Grijander
<dev_crisalix@...> wrote:

>
> Hi all!
> I am using vtkMarchingCubes to calculate a 3D mesh of a volume I have. Fist
> I initialize the filter with:
> vtkMarchingCubes* iso = vtkMarchingCubes::New();
> iso->SetInput(object);
> iso->SetValue(0,1); // Surface #0, iso-value=1
> iso->Update();
> then I fill the vtkStructuredPoints.
> The problem I have is, as you can see in the pictures, when you have a close
> look to the trianbles (screen2) you can see duplicated triangles and vertex,
> and this is a huge problem for my application... I supposed vtkMarchingCubes
> should generate a single surface mesh... I don't know if that's the reason,
> but when I fill the vtkStructuredPoints I use
> scalars->InsertValue(cnt, 0) ; and scalars->InsertValue(cnt, 128) ;
> I took all these from an example, I still don't know what you have to set as
> values, either 1 or 128... in addition the result change with this number
> and I'm not sure why.
> What should I use as values? and also why I have this "double" triangles
> mesh?
> thanks!
> Jaime.
> ________________________________
> Windows Live: Make it easier for your friends to see what you’re up to on
> Facebook.
> ________________________________
> Keep your friends updated— even when you’re not signed in.
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> e-mail you.
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> Visit other Kitware open-source projects at
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> Please keep messages on-topic and check the VTK FAQ at:
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>

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[lucas Grijander-2]

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This is my code. Basically I have a mesh "geometry" and I project rays in order to fill the matrix of points. 

***********************************

vtkStructuredPoints *object = prepareVTKObjectForMarching(geom,40);

//Iso-surface using marching cubes

vtkMarchingCubes* iso = vtkMarchingCubes::New();

iso->SetInput(object);

iso->SetValue(0,1); // Surface #0, iso-value=1

iso->Update();

then the function prepareVTKObjectForMarching

vtkStructuredPoints* prepareVTKObjectForMarching(osg::Geometry *geometry, int steps, string name)

{

TBBox bbox = createBoundingBox(geometry);

bbox.length[0] *= 1.2;

bbox.length[1] *= 1.2;

bbox.length[2] *= 1.2;

float lengthStep = bbox.length[bbox.maxLAxis]/(float)steps;

int dim[3];

dim[0] = steps;

dim[1] = steps;

dim[2] = steps;

double ar[3];

ar[0] = lengthStep;

ar[1] = lengthStep;

ar[2] = lengthStep;

    double origin[3];

origin[0] = bbox.origin[0];

origin[1] = bbox.origin[1];

origin[2] = bbox.origin[2];

vtkStructuredPoints *strcP = vtkStructuredPoints::New();

// Set data dimensions, spacing and origin

    strcP->SetDimensions(dim); 

    strcP->SetSpacing(ar);

    strcP->SetOrigin(origin); 

    vtkDataSet *ds = strcP ;

    vtkDataSetAttributes *a = ds->GetPointData() ;

    // Data may be vtkUnsignedCharArray or vtkUnsignedShortArray

    vtkUnsignedCharArray *scalars = vtkUnsignedCharArray::New();

unsigned int cnt = 0;

float zInit = origin[2];

for(int x = 0; x < steps; x++)

{

float xf = bbox.origin[0] + x*lengthStep;

for(int y = 0; y < steps; y++)

{

float yf = bbox.origin[1] + y*lengthStep;

vector<float> listT = getIntersectionPoints(xf,yf,zInit,geometry);

if(listT.size() == 2)

{

float zIn = zInit + listT.at(0);

float zOut = zInit + listT.at(1);

bool particleAdded = false;

for(int z = 0; z < steps; z++)

{

float zf = origin[2] + z*lengthStep;

if(zf >= zIn && zf <= zOut)

{

scalars->InsertValue(cnt, 128) ;

particleAdded = true;

}

else if(zf < zIn)scalars->InsertValue(cnt, 0) ;

else if(zf > zOut && particleAdded == false)

{

scalars->InsertValue(cnt,128);

particleAdded = true;

}

else scalars->InsertValue(cnt, 0) ;

cnt++;

}

}

else if(listT.size() == 4)

{

float zIn1 = zInit + listT.at(0);

float zOut1 = zInit + listT.at(1);

float zIn2 = zInit + listT.at(2);

float zOut2 = zInit + listT.at(3);

for(int z = 0; z < steps; z++)

{

float zf = origin[2] + z*lengthStep;

if((z >= zIn1 && z <= zOut1) || (z >= zIn2 && z <= zOut2))

{

scalars->InsertValue(cnt, 128);

}

else scalars->InsertValue(cnt, 0) ;

cnt++;

}

}

else

{

for(int z = 0; z < steps; z++)

{

scalars->InsertValue(cnt, 0) ;

cnt++;

}

}

}

}

a->SetScalars(scalars) ;

return strcP;

}

> Date: Wed, 11 Nov 2009 10:33:06 -0500
> Subject: Re: [vtkusers] duplicated vertex in marching cubes?
> From: bill.lorensen@...
> To: dev_crisalix@...
> CC: vtkusers@...
>
> Please provide a small, complete example. MC should not generate
> duplicate points or vertices. What is the datatype of your scalars?
>
> On Wed, Nov 11, 2009 at 10:20 AM, lucas Grijander
> <dev_crisalix@...> wrote:
> >
> > Hi all!
> > I am using vtkMarchingCubes to calculate a 3D mesh of a volume I have. Fist
> > I initialize the filter with:
> > vtkMarchingCubes* iso = vtkMarchingCubes::New();
> > iso->SetInput(object);
> > iso->SetValue(0,1); // Surface #0, iso-value=1
> > iso->Update();
> > then I fill the vtkStructuredPoints.
> > The problem I have is, as you can see in the pictures, when you have a close
> > look to the trianbles (screen2) you can see duplicated triangles and vertex,
> > and this is a huge problem for my application... I supposed vtkMarchingCubes
> > should generate a single surface mesh... I don't know if that's the reason,
> > but when I fill the vtkStructuredPoints I use
> > scalars->InsertValue(cnt, 0) ; and scalars->InsertValue(cnt, 128) ;
> > I took all these from an example, I still don't know what you have to set as
> > values, either 1 or 128... in addition the result change with this number
> > and I'm not sure why.
> > What should I use as values? and also why I have this "double" triangles
> > mesh?
> > thanks!
> > Jaime.
> > ________________________________
> > Windows Live: Make it easier for your friends to see what you’re up to on
> > Facebook.
> > ________________________________
> > Keep your friends updated— even when you’re not signed in.
> > ________________________________
> > Windows Live: Friends get your Flickr, Yelp, and Digg updates when they
> > e-mail you.
> > _______________________________________________
> > Powered by www.kitware.com
> >
> > Visit other Kitware open-source projects at
> > http://www.kitware.com/opensource/opensource.html
> >
> > Please keep messages on-topic and check the VTK FAQ at:
> > http://www.vtk.org/Wiki/VTK_FAQ
> >
> > Follow this link to subscribe/unsubscribe:
> > http://www.vtk.org/mailman/listinfo/vtkusers
> >
> >

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[Bill Lorensen-2]

Try iso->SetValue(0,64);

On Wed, Nov 11, 2009 at 10:40 AM, lucas Grijander
<dev_crisalix@...> wrote:

> This is my code. Basically I have a mesh "geometry" and I project rays in
> order to fill the matrix of points.
> ***********************************
> vtkStructuredPoints *object = prepareVTKObjectForMarching(geom,40);
> //Iso-surface using marching cubes
> vtkMarchingCubes* iso = vtkMarchingCubes::New();
> iso->SetInput(object);
> iso->SetValue(0,1); // Surface #0, iso-value=1
> iso->Update();
> then the function prepareVTKObjectForMarching
> vtkStructuredPoints* prepareVTKObjectForMarching(osg::Geometry *geometry,
> int steps, string name)
> {
> TBBox bbox = createBoundingBox(geometry);
> bbox.length[0] *= 1.2;
> bbox.length[1] *= 1.2;
> bbox.length[2] *= 1.2;
> float lengthStep = bbox.length[bbox.maxLAxis]/(float)steps;
> int dim[3];
> dim[0] = steps;
> dim[1] = steps;
> dim[2] = steps;
> double ar[3];
> ar[0] = lengthStep;
> ar[1] = lengthStep;
> ar[2] = lengthStep;
>     double origin[3];
> origin[0] = bbox.origin[0];
> origin[1] = bbox.origin[1];
> origin[2] = bbox.origin[2];
> vtkStructuredPoints *strcP = vtkStructuredPoints::New();
> // Set data dimensions, spacing and origin
>     strcP->SetDimensions(dim);
>     strcP->SetSpacing(ar);
>     strcP->SetOrigin(origin);
>     vtkDataSet *ds = strcP ;
>     vtkDataSetAttributes *a = ds->GetPointData() ;
>     // Data may be vtkUnsignedCharArray or vtkUnsignedShortArray
>     vtkUnsignedCharArray *scalars = vtkUnsignedCharArray::New();
> unsigned int cnt = 0;
>
> float zInit = origin[2];
> for(int x = 0; x < steps; x++)
> {
> float xf = bbox.origin[0] + x*lengthStep;
> for(int y = 0; y < steps; y++)
> {
> float yf = bbox.origin[1] + y*lengthStep;
> vector<float> listT = getIntersectionPoints(xf,yf,zInit,geometry);
> if(listT.size() == 2)
> {
> float zIn = zInit + listT.at(0);
> float zOut = zInit + listT.at(1);
> bool particleAdded = false;
> for(int z = 0; z < steps; z++)
> {
> float zf = origin[2] + z*lengthStep;
> if(zf >= zIn && zf <= zOut)
> {
> scalars->InsertValue(cnt, 128) ;
> particleAdded = true;
> }
> else if(zf < zIn)scalars->InsertValue(cnt, 0) ;
> else if(zf > zOut && particleAdded == false)
> {
> scalars->InsertValue(cnt,128);
> particleAdded = true;
> }
> else scalars->InsertValue(cnt, 0) ;
> cnt++;
> }
> }
> else if(listT.size() == 4)
> {
> float zIn1 = zInit + listT.at(0);
> float zOut1 = zInit + listT.at(1);
> float zIn2 = zInit + listT.at(2);
> float zOut2 = zInit + listT.at(3);
> for(int z = 0; z < steps; z++)
> {
> float zf = origin[2] + z*lengthStep;
> if((z >= zIn1 && z <= zOut1) || (z >= zIn2 && z <= zOut2))
> {
> scalars->InsertValue(cnt, 128);
> }
> else scalars->InsertValue(cnt, 0) ;
> cnt++;
> }
> }
> else
> {
> for(int z = 0; z < steps; z++)
> {
> scalars->InsertValue(cnt, 0) ;
> cnt++;
> }
> }
> }
> }
> a->SetScalars(scalars) ;
> return strcP;
> }
>
>
>> Date: Wed, 11 Nov 2009 10:33:06 -0500
>> Subject: Re: [vtkusers] duplicated vertex in marching cubes?
>> From: bill.lorensen@...
>> To: dev_crisalix@...
>> CC: vtkusers@...
>>
>> Please provide a small, complete example. MC should not generate
>> duplicate points or vertices. What is the datatype of your scalars?
>>
>> On Wed, Nov 11, 2009 at 10:20 AM, lucas Grijander
>> <dev_crisalix@...> wrote:
>> >
>> > Hi all!
>> > I am using vtkMarchingCubes to calculate a 3D mesh of a volume I have.
>> > Fist
>> > I initialize the filter with:
>> > vtkMarchingCubes* iso = vtkMarchingCubes::New();
>> > iso->SetInput(object);
>> > iso->SetValue(0,1); // Surface #0, iso-value=1
>> > iso->Update();
>> > then I fill the vtkStructuredPoints.
>> > The problem I have is, as you can see in the pictures, when you have a
>> > close
>> > look to the trianbles (screen2) you can see duplicated triangles and
>> > vertex,
>> > and this is a huge problem for my application... I supposed
>> > vtkMarchingCubes
>> > should generate a single surface mesh... I don't know if that's the
>> > reason,
>> > but when I fill the vtkStructuredPoints I use
>> > scalars->InsertValue(cnt, 0) ; and scalars->InsertValue(cnt, 128) ;
>> > I took all these from an example, I still don't know what you have to
>> > set as
>> > values, either 1 or 128... in addition the result change with this
>> > number
>> > and I'm not sure why.
>> > What should I use as values? and also why I have this "double" triangles
>> > mesh?
>> > thanks!
>> > Jaime.
>> > ________________________________
>> > Windows Live: Make it easier for your friends to see what you’re up to
>> > on
>> > Facebook.
>> > ________________________________
>> > Keep your friends updated— even when you’re not signed in.
>> > ________________________________
>> > Windows Live: Friends get your Flickr, Yelp, and Digg updates when they
>> > e-mail you.
>> > _______________________________________________
>> > Powered by www.kitware.com
>> >
>> > Visit other Kitware open-source projects at
>> > http://www.kitware.com/opensource/opensource.html
>> >
>> > Please keep messages on-topic and check the VTK FAQ at:
>> > http://www.vtk.org/Wiki/VTK_FAQ
>> >
>> > Follow this link to subscribe/unsubscribe:
>> > http://www.vtk.org/mailman/listinfo/vtkusers
>> >
>> >
>
> ________________________________
> Windows Live: Keep your friends up to date with what you do online.

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[Dominik Szczerba-2]

I will probably irritate Bill by repeating again that yes, I do
(non-reproducibly :() use to get duplicate points from MC. To ensure
robust results try to simply merge the duplicate points.

Bill Lorensen wrote:

> Please provide a small, complete example. MC should not generate
> duplicate points or vertices. What is the datatype of your scalars?
>
> On Wed, Nov 11, 2009 at 10:20 AM, lucas Grijander
> <dev_crisalix@...> wrote:
>> Hi all!
>> I am using vtkMarchingCubes to calculate a 3D mesh of a volume I have. Fist
>> I initialize the filter with:
>> vtkMarchingCubes* iso = vtkMarchingCubes::New();
>> iso->SetInput(object);
>> iso->SetValue(0,1); // Surface #0, iso-value=1
>> iso->Update();
>> then I fill the vtkStructuredPoints.
>> The problem I have is, as you can see in the pictures, when you have a close
>> look to the trianbles (screen2) you can see duplicated triangles and vertex,
>> and this is a huge problem for my application... I supposed vtkMarchingCubes
>> should generate a single surface mesh... I don't know if that's the reason,
>> but when I fill the vtkStructuredPoints I use
>> scalars->InsertValue(cnt, 0) ; and scalars->InsertValue(cnt, 128) ;
>> I took all these from an example, I still don't know what you have to set as
>> values, either 1 or 128... in addition the result change with this number
>> and I'm not sure why.
>> What should I use as values? and also why I have this "double" triangles
>> mesh?
>> thanks!
>> Jaime.
>> ________________________________
>> Windows Live: Make it easier for your friends to see what you’re up to on
>> Facebook.
>> ________________________________
>> Keep your friends updated— even when you’re not signed in.
>> ________________________________
>> Windows Live: Friends get your Flickr, Yelp, and Digg updates when they
>> e-mail you.
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>>
>>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
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