Hi,
I'm using the code below, mixture taken from the examples.
It's only rendering black. Anything I'm doing wrong?
Thank you!
The function takes a node providing a new scene, and a back color.
It returns a node containing a quad with the texture being the new scene
rendered to it.
Code:
osg::Node* create(osg::Node* subgraph, const osg::Vec4& clearColour)
{
osg::Group* distortionNode = new osg::Group;
unsigned int tex_width = 1024;
unsigned int tex_height = 1024;
osg::Texture2D* texture = new osg::Texture2D;
texture->setTextureSize(tex_width, tex_height);
texture->setInternalFormat(GL_RGBA);
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
// set up the render to texture camera.
{
osg::Camera* camera = new osg::Camera;
// set clear the color and depth buffer
camera->setClearColor(clearColour);
camera->setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
// just inherit the main cameras view
camera->setReferenceFrame(osg::Transform::RELATIVE_RF);
camera->setProjectionMatrix(osg::Matrixd::identity());
camera->setViewMatrix(osg::Matrixd::identity());
// set viewport
camera->setViewport(0,0,tex_width,tex_height);
// set the camera to render before the main camera.
camera->setRenderOrder(osg::Camera::PRE_RENDER);
// tell the camera to use OpenGL frame buffer object where supported.
camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
// attach the texture and use it as the color buffer.
camera->attach(osg::Camera::COLOR_BUFFER, texture);
// add subgraph to render
camera->addChild(subgraph);
distortionNode->addChild(camera);
}
{
osg::Geometry* polyGeom = new osg::Geometry;
osg::Vec3Array* vertices = new osg::Vec3Array;
float depth = 10.f;
vertices->push_back(osg::Vec3(-20,20,depth));
vertices->push_back(osg::Vec3(-20,-20,depth));
vertices->push_back(osg::Vec3(20,-20,depth));
vertices->push_back(osg::Vec3(20,20,depth));
polyGeom->setVertexArray(vertices);
osg::Vec3Array* normals = new osg::Vec3Array;
normals->push_back(osg::Vec3(0.0f,0.0f,1.0f));
polyGeom->setNormalArray(normals);
polyGeom->setNormalBinding(osg::Geometry::BIND_OVERALL);
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.f,1.0f));
polyGeom->setColorArray(colors);
polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
polyGeom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS,0,4));
// new we need to add the texture to the Drawable, we do so by creating
a
// StateSet to contain the Texture StateAttribute.
osg::StateSet* stateset = polyGeom->getOrCreateStateSet();
stateset->setTextureAttributeAndModes(0,
texture,osg::StateAttribute::ON);
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
osg::Geode* geode = new osg::Geode();
geode->addDrawable(polyGeom);
distortionNode->addChild(geode);
}
return distortionNode;
}
Cheers,
Paul
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http://forum.openscenegraph.org/viewtopic.php?p=46393#46393
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