Textures corrupting my 2DActors

[Lisa S. Avila]

Oops, I should always do a cvs update before chasing after bugs - chances 
are Bill Lorensen will have gotten to it before me (as he did in this case).


At 05:33 PM 4/6/00, Robert Stein wrote:
>Well here's kind of a strange one for you...
>
>Let's say that I've got a plane with a texture applied to it... this is a
>regular 3D actor... and I want to be able to pan rotate zoom etc... with
>it...  Next I want to have some sort of Heads up display... so I'll create
>some polydata and stick it into a vtkPolyData2DMapper and then give it to a
>vtkActor2D with the right screen coordinates...
>
>Here's the problem... when I do this, my 2D Actor wether it be a polygon or
>lines or whatever, seems to pick up the last texture to be applied to a
>totatlly separate actor in the 3D scene... I'm very puzzled by this and
>wonder if it's a vtk bug, or something I'm doing wrong...
>
>I've boiled it down to a simple test case here, and I've included the c++
>code to run it... just give the program a *.ppm file on the command line
>and it will texture the plane (and the 2D triangle) with it...  If someone
>could help me out here that would be great...
>
>
>Thanks,
>
>Rob Stein
>
>// vtk includes
>#include "vtkRenderer.h"
>#include "vtkRenderWindow.h"
>#include "vtkRenderWindowInteractor.h"
>#include "vtkPNMReader.h"
>#include "vtkTexture.h"
>#include "vtkPlaneSource.h"
>#include "vtkPolyDataMapper.h"
>#include "vtkPolyDataMapper2D.h"
>#include "vtkActor2D.h"
>#include "vtkActor.h"
>
>vtkRenderer* ren1;
>vtkRenderWindow* renWin;
>
>void user(void* d){
>  // load the texture map
>   vtkPNMReader *pnm = vtkPNMReader::New();
>     pnm->SetFileName("test.ppm");
>   vtkTexture *atext = vtkTexture::New();
>     atext->SetInput(pnm->GetOutput());
>     atext->InterpolateOn();
>
>   vtkPlaneSource *plane = vtkPlaneSource::New();
>   vtkPolyDataMapper *planeMapper = vtkPolyDataMapper::New();
>     planeMapper->SetInput(plane->GetOutput());
>   vtkActor *planeActor = vtkActor::New();
>     planeActor->SetMapper(planeMapper);
>     planeActor->SetTexture(atext);
>
>   ren1->AddActor(planeActor);
>   renWin->Render();
>}
>
>void main (int argc, char *argv[]) {
>   if(argc<2){
>     fprintf(stderr, "Usage %s: <filename.ppm>\n", argv[0]);
>     exit(0);
>   }
>
>   renWin = vtkRenderWindow::New();
>   ren1 = vtkRenderer::New();
>   vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
>   renWin->AddRenderer(ren1);
>   iren->SetRenderWindow(renWin);
>   //iren->SetUserMethod(user, NULL);
>
>   // load the texture map
>   vtkPNMReader *pnm = vtkPNMReader::New();
>     pnm->SetFileName(argv[1]);
>   vtkTexture *atext = vtkTexture::New();
>     atext->SetInput(pnm->GetOutput());
>     atext->InterpolateOn();
>
>   vtkPlaneSource *plane = vtkPlaneSource::New();
>   vtkPolyDataMapper *planeMapper = vtkPolyDataMapper::New();
>     planeMapper->SetInput(plane->GetOutput());
>   vtkActor *planeActor = vtkActor::New();
>     planeActor->SetMapper(planeMapper);
>     planeActor->SetTexture(atext);
>
>   ren1->AddActor(planeActor);
>   ren1->SetBackground(0.2,0.3,0.4);
>   renWin->SetSize(300,300);
>
>   vtkPolyData* camera = vtkPolyData::New();
>   vtkCellArray* cells = vtkCellArray::New();
>   vtkPoints* points = vtkPoints::New();
>   int pts[3] = { 0, 1, 2 };
>   points->InsertPoint(0, -20, -20, 0);
>   points->InsertPoint(1, 20, -20, 0);
>   points->InsertPoint(2, 0, 20, 0);
>   cells->InsertNextCell(3, pts);
>   camera->SetPoints(points);
>   camera->SetPolys(cells);
>
>   vtkPolyDataMapper2D* cameraMapper = vtkPolyDataMapper2D::New();
>   cameraMapper->SetInput(camera);
>   vtkActor2D* cameraActor = vtkActor2D::New();
>   cameraActor->SetMapper(cameraMapper);
>   cameraActor->SetPosition(100, 100);
>   ren1->AddActor(cameraActor);
>
>   renWin->Render();
>   iren->Start(); // start rendering
>}
>
>Robert J. Stein
>National Center For Supercomputing Applications
>405 N. Matthews, Urbana, IL
>(217) 244-7584
>rstein at ncsa.uiuc.edu


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