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POAligning osgViewer Camera with an Image
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  1. POAligning osgViewer Camera with an Image
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    copied!<p>As a precursor to render to texture, I am trying to simply align the osgViewer's camera to a texture mapped plane.</p> <p>This is the code I employ for the same:</p> <pre><code>int main() { osgViewer::Viewer viewer; osg::ref_ptr&lt;osg::Image&gt; image = osgDB::readImageFile("path//to//file.png"); if (!image.valid()) { assert(false); return 1; } osg::ref_ptr&lt;osg::Geometry&gt; pictureQuad = osg::createTexturedQuadGeometry(osg::Vec3(0.f,0.f,0.f), osg::Vec3(image-&gt;s(),0.f,0.f), osg::Vec3(0.f,0.f,image-&gt;t()), 0.f, 0.f, image-&gt;s(), image-&gt;t()); osg::ref_ptr&lt;osg::TextureRectangle&gt; textureRect = new osg::TextureRectangle(image); textureRect-&gt;setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR); textureRect-&gt;setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR); textureRect-&gt;setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE); textureRect-&gt;setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE); pictureQuad-&gt;getOrCreateStateSet()-&gt;setTextureAttributeAndModes(0, textureRect.get(), osg::StateAttribute::ON); pictureQuad-&gt;getOrCreateStateSet()-&gt;setMode(GL_DEPTH_TEST, osg::StateAttribute::ON); osg::ref_ptr&lt;osg::Geode&gt; geode = new osg::Geode(); geode-&gt;setDataVariance(osg::Object::DYNAMIC); geode-&gt;addDrawable(pictureQuad.get()); osg::StateSet *state = geode-&gt;getOrCreateStateSet(); state-&gt;setMode( GL_LIGHTING, osg::StateAttribute::PROTECTED | osg::StateAttribute::OFF ); viewer.setSceneData(geode); osg::ref_ptr&lt;osg::Camera&gt; camera = viewer.getCamera(); while( !viewer.done() ) { camera-&gt;setReferenceFrame(osg::Transform::ABSOLUTE_RF); camera-&gt;setProjectionMatrix(osg::Matrix::ortho2D(0.f, image-&gt;s(), 0.f, image-&gt;t())); camera-&gt;setViewMatrixAsLookAt(osg::Vec3f(0.f, -100.f, 0.f), osg::Vec3f(image-&gt;s()*0.5, 0.f, image-&gt;t()*0.5f), osg::Vec3f(0.f, 0.f, 1.f)); viewer.frame(); } return 0; } </code></pre> <p>However, the results show me a view that is completely skewed. Can someone please point out the bug in my code?</p>
 

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