For an AR project, I need to render a model with video image as background. My program is based around osgViewer using osg v2.0. I found an example for a HUD and with a few changes made it work as background. The code can be found below.
The code runs ok but there is a problem occurring that I cannot figure out. Any ideas … ? When new images are loaded, they are rescaled for some reason. This adds a noticeable delay, ~250 ms, and distorts the images, which is not acceptable. Output looks like "Scaling image 'x' from (720,480) to (512,512)". To prevent resizing I use "BGTexture->setResizeNonPowerOfTwoHint(false)". To update an image I use "BGTexture->setImage(newImg)". Thanks, John root->addChild(BGProjectionMatrix); BGProjectionMatrix->setMatrix(osg::Matrix::ortho2D(0,width,0,height)); BGProjectionMatrix->addChild(BGModelViewMatrix); BGModelViewMatrix->setMatrix(osg::Matrix::identity()); BGModelViewMatrix->setReferenceFrame(osg::Transform::ABSOLUTE_RF); BGModelViewMatrix->addChild( BGGeode ); BGTexture->setDataVariance(osg::Object::DYNAMIC); BGTexture->setResizeNonPowerOfTwoHint(false); // <-- BGTexture->setImage(BGImage); BGGeode->addDrawable(BGBackgroundGeometry); BGGeode->setStateSet(BGStateSet); BGBackgroundVertices->push_back( osg::Vec3( 0, 0, 0) ); BGBackgroundVertices->push_back( osg::Vec3(width, 0, 0) ); BGBackgroundVertices->push_back( osg::Vec3(width, height, 0) ); BGBackgroundVertices->push_back( osg::Vec3( 0, height, 0) ); (*texcoords)[0].set(0.0f,0.0f); (*texcoords)[1].set(1.0f,0.0f); (*texcoords)[2].set(1.0f,1.0f); (*texcoords)[3].set(0.0f,1.0f); BGcolors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f)); BGnormals->push_back(osg::Vec3(1.0f,1.0f,1.0f)); BGBackgroundGeometry->setTexCoordArray(0,texcoords); BGBackgroundGeometry->setColorArray(BGcolors); BGBackgroundGeometry->setColorBinding(osg::Geometry::BIND_OVERALL); BGBackgroundGeometry->setNormalArray(BGnormals); BGBackgroundGeometry->setNormalBinding(osg::Geometry::BIND_OVERALL); BGBackgroundGeometry->addPrimitiveSet(BGBackgroundIndices); BGBackgroundGeometry->setVertexArray(BGBackgroundVertices); BGBackgroundIndices->push_back(0); BGBackgroundIndices->push_back(1); BGBackgroundIndices->push_back(2); BGBackgroundIndices->push_back(3); BGStateSet->setTextureAttributeAndModes(0,BGTexture,osg::StateAttribute::ON); BGStateSet->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF); BGStateSet->setRenderingHint( osg::StateSet::TRANSPARENT_BIN ); BGStateSet->setRenderBinDetails( 1, "RenderBin"); _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
