Render Individual SceneNode

[kklouzal]

I need to render an individual scene node so it can be rendered-to-texture. I've been searching through the forums and can't figure it out.
Basically what I've learned is, you need to hide all scene nodes but the one you want to render then call drawAll() but I can't find a way to actually get an array of all scene nodes. I would rather not have to loop through each node, hide them, drawAll(), loop again, then unhide. There must be a way to just individually render a node without all this fuss?

I actually have no need to even use a scene node here if I could just draw an IMesh.

[Foaly]

You can always render your nodes or meshes using the video driver or simply calling render() on a scene node.
But you have to take care of the lights and the camera. To set the camera's projection matrix, you can call render() on the camera node before rendering you stuff.

Just try it?

[kklouzal]

After lots of trial and error here it is, complete render code, well mostly ;)

Code: Select all

                m_Driver->beginScene();
                //  Set Render-Target
                m_Driver->setRenderTarget(RTT, true, true, irr::video::SColor(0, 0, 0, 0));
 
                //  Get the mesh and draw it
                irr::scene::IMesh* ModelMesh = m_SceneManager->getMesh(ModelPath.c_str());
                ModelMesh->setMaterialFlag(irr::video::EMF_LIGHTING, false);
                const irr::core::vector3df Extent = ModelMesh->getBoundingBox().getExtent();
 
                ActiveCamera->render();
                irr::core::matrix4 Transformation;
                Transformation.setTranslation(irr::core::vector3df(Extent.X, 0, Extent.Z));
                Transformation.setRotationDegrees(irr::core::vector3df(-33, 17, 0));
                m_Driver->setTransform(irr::video::ETS_WORLD, Transformation);
                const irr::u32 mb_Count = ModelMesh->getMeshBufferCount();
                for (irr::u32 i = 0; i < mb_Count; i++)
                {
                    m_Driver->setMaterial(ModelMesh->getMeshBuffer(i)->getMaterial());
                    m_Driver->drawMeshBuffer(ModelMesh->getMeshBuffer(i));
                }
 
                //  Reset Render-Target
                m_Driver->setRenderTarget(NULL, false, false);
                m_Driver->endScene();

Big thanks to Foaly for telling me to render the camera. :P