Textures corrupting my 2DActors

[Lisa S. Avila]

Hi Robert,

It looks like we need a glDisable( GL_TEXTURE_2D ) somewhere in the 2D 
mapper since it is turned on during the rendering of the 3D actor then 
never turned off again. I've added it to the vtkOpenGLPolyDataMapper2D, but 
it probably needs to be a few more places too.

Lisa

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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