Hi Dirk
Dirk Reiners schrieb:
Or can I use a PolygonForeground instead
with a second Viewport, that is hidden?
That was the idea, yes. Add a new Viewport with your desired size, and
add it to the front of the port Field in the Window, so that it is
rendered first. You need to set a Camera, a scene root and a background,
otherwise the Viewport won't render. They won't matter as you're hiding
everything behind a PolygonForeground, but the Viewport needs them to
work (I might relax that in future versions, but that's what it is right
now). Then add your PolygonForeground and a GrabForeground or
TextureGrabForeground to get stuff into a usable place.
Hope it helps
Dirk
Thanks, that all worked fine so far, but I don't get the
PolygonForeground to work and I don't see my mistake, if I have one.
But I think I have, because my application crashes at startup. Anyway,
the PolygonForeground usage seems a bit strange to me, because of the 2d
positions and the 3d texture coordinates.
Here is my code. (I've tried an ImageForeground instead of the
PolygonForeground, that worked fine, but this does not!)
// ------------
// data image (add here more data textures)
ImagePtr _image = Image::create();
image->read("data/dataImages/dataset01.tif");
// and result image
ImagePtr _result = Image::create();
// texture for the polygon foreground
TextureChunkPtr tex = TextureChunk::create();
tex->setImage(_image);
tex->setEnvMode(GL_MODULATE);
tex->setMinFilter(GL_LINEAR_MIPMAP_LINEAR);
tex->setMagFilter(GL_NEAREST);
// texture for the texture grab foreground
TextureChunkPtr result = TextureChunk::create();
result->setImage(_result);
result->setEnvMode(GL_MODULATE);
result->setMinFilter(GL_LINEAR_MIPMAP_LINEAR);
result->setMagFilter(GL_NEAREST);
// material for the polygon foreground
ChunkMaterialPtr mat = ChunkMaterial::create();
mat->addChunk(tex);
/*
// try the image foreground instead
ImageForegroundPtr polyFrgnd = ImageForeground::create();
polyFrgnd->addImage(_image, Pnt2f(0,0));
*/
// the polygon foreground
PolygonForegroundPtr polyFrgnd = PolygonForeground::create();
polyFrgnd->setMaterial(mat);
polyFrgnd->getMFPositions()->push_back(Pnt2f(0.0, 0.0));
polyFrgnd->getMFPositions()->push_back(Pnt2f(1.0, 0.0));
polyFrgnd->getMFPositions()->push_back(Pnt2f(1.0, 1.0));
polyFrgnd->getMFPositions()->push_back(Pnt2f(0.0, 1.0));
polyFrgnd->getMFTexCoords()->push_back(Vec3f(0.0, 0.0, 0.0));
polyFrgnd->getMFTexCoords()->push_back(Vec3f(1.0, 0.0, 0.0));
polyFrgnd->getMFTexCoords()->push_back(Vec3f(1.0, 1.0, 0.0));
polyFrgnd->getMFTexCoords()->push_back(Vec3f(0.0, 1.0, 0.0));
// the texture grab foreground
TextureGrabForegroundPtr grabFrgnd = TextureGrabForeground::create();
grabFrgnd->setTexture(result);
// the camera
MatrixCameraPtr cam = MatrixCamera::create();
cam->setNear(0.1);
cam->setFar(10);
cam->setModelviewMatrix(Matrix::identity());
cam->setProjectionMatrix(Matrix::identity());
// m_vp is the first viewport, m_vp2 is the second
m_vp2 = Viewport::create();
m_vp2->setCamera(cam);
m_vp2->setBackground(m_vp->getBackground());
m_vp2->getMFForegrounds()->push_back(polyFrgnd);
m_vp2->getMFForegrounds()->push_back(grabFrgnd);
m_vp2->setRoot(makeCoredNode<Group>());
m_vp2->setSize(0,0,256.0f/w,256.0f/h);
// ------------
I think, this should be the last of this emails.
And thanks for the help.
Oliver
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