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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This is a good idea. But how does this work for a cube? How is
it possible to add an Actor/Texture to each side of the cube? Do you have a
code example?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Andy<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Von:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Wes Turner
[mailto:wes.turner@kitware.com] <br>
<b>Gesendet:</b> Dienstag, 24. November 2009 23:02<br>
<b>An:</b> André Rohde<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Betreff:</b> Re: [vtkusers] Textures<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I believe that there is a limit of one texture per vtkActor,
which gives you two alternatives. Either you need to combine your 6 views
into a single texture or you need to make each side of the cube a separate
actor.<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>- Wes<o:p></o:p></p>
<div>
<p class=MsoNormal>2009/11/24 "André Rohde" <<a
href="mailto:Rohy@gmx.de">Rohy@gmx.de</a>><o:p></o:p></p>
<p class=MsoNormal>Dear Vtk Users,<br>
i´d like to map one texture to each side of a cube (6 sides = 6 different
textures) from different arrays. (Only one Array in my Code yet)<br>
Mapping one texture to the cube works fine for me. But i don´t have an idea how
this is gonna work for each side of a cube. The general idea behind my program
is to take an specific amount of snapshots from a camera and generate an
array/cube of this pictures in vtk.<br>
<br>
Here´s my Code:<br>
<br>
//First Array > Image Data should be mapped to the first side of the cube...<br>
vtkFloatArray *vtkArray = vtkFloatArray::New();<br>
vtkArray->SetNumberOfComponents(1);<br>
vtkArray->SetNumberOfTuples(1392*1040);<br>
<br>
unsigned indexInverted = 0;<br>
<br>
for(int k = 0; k < 1040; k++)<br>
{<br>
for(int l = 0; l < 1392; l++)<br>
{<br>
//pcFrame contains the ImageData from the Camera<br>
vtkArray->SetTuple1(indexInverted,pcFrame[((1392*1040)-(1392*(k+1)))+l]);<br>
indexInverted++;<br>
}<br>
}<br>
<br>
vtkImageData *myImage = vtkImageData::New();<br>
myImage->SetDimensions(1392,1040,1);<br>
myImage->SetSpacing(1,1,1);<br>
myImage->SetOrigin(0,0,0);<br>
myImage->SetNumberOfScalarComponents(1);<br>
myImage->SetScalarTypeToFloat();<br>
myImage->AllocateScalars();<br>
myImage->GetPointData()->SetScalars(vtkArray);<br>
<br>
int i;<br>
//Cube Coordinates<br>
static float x[8][3]={{0,0,0}, {1392,0,0}, {1392,1040,0}, {0,1040,0},
{0,0,700}, {1392,0,700}, {1392,1040,700}, {0,1040,700}};<br>
<br>
static vtkIdType pts[6][4]={{0,1,2,3},{4,5,6,7}, {0,1,5,4},{1,2,6,5},
{2,3,7,6}, {3,0,4,7}};<br>
<br>
// Color LookupTable<br>
vtkLookupTable *table = vtkLookupTable::New();<br>
table->SetTableRange(0,255);<br>
table->SetValueRange(0.0,1.0);<br>
table->SetSaturationRange(0.0,0.0);<br>
table->SetHueRange(0.0,0.0);<br>
table->SetAlphaRange(1.0,1.0);<br>
table->SetNumberOfColors(256);<br>
table->Build();<br>
<br>
<br>
// Create texture<br>
vtkTexture *atext = vtkTexture::New();<br>
atext->SetInput(myImage);<br>
atext->SetLookupTable(table);<br>
atext->InterpolateOff();<br>
<br>
// We'll create the building blocks of polydata including data attributes.<br>
vtkPolyData *cube = vtkPolyData::New();<br>
vtkPoints *points = vtkPoints::New();<br>
vtkCellArray *polys = vtkCellArray::New();<br>
vtkFloatArray *tCoords = vtkFloatArray::New();<br>
<br>
tCoords->SetNumberOfComponents(2);<br>
tCoords->InsertTuple2(0, 0, 0);<br>
tCoords->InsertTuple2(1, 1, 0);<br>
tCoords->InsertTuple2(2, 1, 1);<br>
tCoords->InsertTuple2(3, 0, 1);<br>
tCoords->InsertTuple2(4, 0, 0);<br>
tCoords->InsertTuple2(5, 1, 0);<br>
tCoords->InsertTuple2(6, 1, 1);<br>
tCoords->InsertTuple2(7, 0, 1);<br>
<br>
// Load the point, cell, and data attributes.<br>
for (i=0; i<8; i++) points->InsertPoint(i,x[i]);<br>
for (i=0; i<6; i++) polys->InsertNextCell(4,pts[i]);<br>
<br>
// We now assign the pieces to the vtkPolyData.<br>
cube->SetPoints(points);<br>
points->Delete();<br>
cube->SetPolys(polys);<br>
polys->Delete();<br>
cube->GetPointData()->SetTCoords(tCoords);<br>
tCoords->Delete();<br>
<br>
<br>
vtkPolyDataMapper *cubeMapper = vtkPolyDataMapper::New();<br>
cubeMapper->SetInput(cube);<br>
vtkActor *cubeActor = vtkActor::New();<br>
cubeActor->SetMapper(cubeMapper);<br>
cubeActor->SetTexture(atext);<br>
<br>
// The usual rendering stuff.<br>
vtkCamera *camera = vtkCamera::New();<br>
camera->SetPosition(1,1,1);<br>
camera->SetFocalPoint(0,0,0);<br>
<br>
vtkRenderer *renderer = vtkRenderer::New();<br>
vtkRenderWindow *renWin = vtkRenderWindow::New();<br>
renWin->AddRenderer(renderer);<br>
<br>
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();<br>
vtkWidget->SetRenderWindow(renWin);<br>
<br>
renderer->AddActor(cubeActor);<br>
renderer->SetActiveCamera(camera);<br>
renderer->ResetCamera();<br>
renderer->SetBackground(0.4,0.5,0.6);<br>
<br>
//interact with data<br>
renWin->Render();<br>
iren->Start();<br>
<br>
with kind regards<br>
Andy<br>
--<br>
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<p class=MsoNormal><br>
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<br>
-- <br>
Wesley D. Turner, Ph.D.<br>
Kitware, Inc.<br>
Technical Leader<br>
28 Corporate Drive<br>
Clifton Park, NY 12065-8662<br>
Phone: 518-881-4920<o:p></o:p></p>
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