[vtkusers] Consistent orientation of cells
Goodwin Lawlor
goodwin.lawlor at ucd.ie
Thu Apr 1 10:05:00 EST 2004
Use vtkPolyDataNormals with the method ConsistencyOn. You might want
SplittingOff too.
Hth
Goodwin
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Today's Topics:
1. Consistent orientation of cells (R K Shyam Prakash)
2. Import image from ARToolKit (Francesco Caruso)
--__--__--
Message: 1
From: "R K Shyam Prakash" <ramakrishna.prakash at quest-global.com>
To: "VTKUserList" <vtkusers at www.vtk.org>
Date: Thu, 1 Apr 2004 16:24:39 +0530
Subject: [vtkusers] Consistent orientation of cells
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Hi,
I have closed polydata surface representated by triangles. In
few casesThe normals of the triangles are not consistent. some of the
triangles have normls oriented towards outside of the surface. Is there
a method which will ensure that all triangle normals are pointed inside
of the polydata?
Thanks
Shyam
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<DIV><SPAN class=3D179075210-01042004><FONT face=3DArial=20
size=3D2>Hi,</FONT></SPAN></DIV> <DIV><SPAN =
class=3D179075210-01042004> =20
<FONT face=3DArial size=3D2>I have closed polydata surface =
representated by=20 triangles. In few casesThe normals of the triangles
are not consistent. = some of=20 the triangles have normls oriented
towards outside of the surface. Is = there a=20 method which will ensure
that all triangle normals are pointed inside of = the=20
polydata?</FONT></SPAN></DIV> <DIV><SPAN
class=3D179075210-01042004><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D179075210-01042004><FONT face=3DArial=20
size=3D2>Thanks</FONT></SPAN></DIV>
<DIV><SPAN class=3D179075210-01042004><FONT face=3DArial=20
size=3D2>Shyam</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV align=3Dleft><FONT color=3D#333399 size=3D3>
<P><U>Disclaimer: </U></P>
<P><U>This electronic message and all attachments contain information =
from=20 QuEST, which may be confidential or otherwise protected from
disclosure. = The=20 information is intended for the addressee only. If
you are not the = addressee,=20 any disclosure, copy, distribution or
use of the contents of this = message is=20 prohibited. If you have
received this electronic message in error, = please notify=20 the sender
immediately and destroy the message.</U></P></FONT></DIV>
<DIV> </DIV></BODY></HTML>
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--__--__--
Message: 2
Date: Thu, 01 Apr 2004 12:55:30 +0200
From: Francesco Caruso <guernika_devel at yahoo.it>
To: vtkusers at vtk.org
Subject: [vtkusers] Import image from ARToolKit
Hello,
i can't display image grabbed by ARToolKit...
ARToolKit grab image and store it in a vector of unsigned char
"dataPtr". i tried to import and show it but the routine crashes due to
an error
of access violation.
i think my mistake is how to pass the dataPtr to vtkImageImport...
please, help!
here are the sources...
static void vtkInit( void )
{
renWin = vtkRenderWindow::New();
ren = vtkRenderer::New();
importer = vtkImageImport::New();
imActor = vtkOpenGLImageActor::New();
importer->SetWholeExtent(0, 319, 0, 239, 0,0); // 320x240
image...
importer->SetDataExtentToWholeExtent();
importer->SetNumberOfScalarComponents( 4 ); // 4 for R G B A
....
importer->SetDataSpacing(1,1,1);
importer->SetDataScalarTypeToUnsignedChar();
imActor->SetInput( importer->GetOutput() );
imActor->SetDisplayExtent(0, 319, 0, 239, 0, 0);
renWin->SetSize(640,480);
renWin->AddRenderer( ren );
ren->AddActor2D( imActor );
}
static void artkInit( void )
{
ARParam wparam;
/* open the video path */
if( arVideoOpen( vconf ) < 0 ) exit(0);
/* find the size of the window */
if( arVideoInqSize(&xsize, &ysize) < 0 ) exit(0);
printf("Image size (x,y) = (%d,%d)\n", xsize, ysize);
/* set the initial camera parameters */
if( arParamLoad(cparam_name, 1, &wparam) < 0 ) {
printf("Camera parameter load error !!\n");
exit(0);
}
arParamChangeSize( &wparam, xsize, ysize, &cparam );
arInitCparam( &cparam );
printf("*** Camera Parameter ***\n");
arParamDisp( &cparam );
if( (patt_id=arLoadPatt(patt_name)) < 0 ) {
printf("pattern load error !!\n");
exit(0);
}
//argInit( &cparam, 2.0, 0, 0, 0, 0 );
arVideoCapStart();
}
static void vtk2artkLoop(void)
{
ARUint8 *dataPtr; // ARTK store the image grabbed in this
vector of unsigned char !!!
/* grab a vide frame */
if( (dataPtr = (ARUint8 *)arVideoGetImage()) == NULL ) {
arUtilSleep(2);
return;
}
importer->SetImportVoidPointer((void * ) dataPtr, 1); // I think
my mistake is HERE !!!
renWin->Render();
arVideoCapNext();
argSwapBuffers();
}
void CleanUp()
{
importer->Delete();
imActor->Delete();
ren->Delete();
renWin->Delete();
arVideoCapStop();
arVideoClose();
argCleanup();
}
void main( int argc, char *argv[] )
{
vtkInit();
artkInit();
for ( i=0; i<20; i++)
vtk2artkLoop();
CleanUp();
}
--__--__--
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