The SoVertexAttribFeedback node allows to record the content of the varyings in a goemetry shader into SoGLBufferObject. In this demo we use a geometry shader to tesselate some triangles by outputing for each triangle a set of three new triangles. Then the generated content is used in a SoBufferedShape and added to the viewer's scene graph.
The node SoVertexAttribFeedback, by default, disables the rasterizer because we want to record the triangles but it is posible to enable it.
SoVertexAttribFeedback, SoBufferedShape, SoBBox, SoGLBufferObject, SoShaderProgram, SoVertexShader, SoFragmentShader, SoGeometryShader