@sinanmut When I create the 3D objects in the initializeGL function, it is fine paintGL function renders these objects. Later on when I want to add new objects to the scene I don't see these new ones being rendered by painGL function. Is there any flag that I have to add in paintGL fuinction or in initializeGL function? Thanks,

SOLVED - I needed to unbind the vertex buffer at the end of my drawing function. [ ... ] glDrawArrays(GL_TRIANGLES, 0, 6); glDisableVertexAttribArray(attribute_coord2d); glBindBuffer (GL_ARRAY_BUFFER, 0); painter->endNativePainting ();

Hi, Just a quick note, the shader code files should appear in the documentation of the next version of Qt (I can't tell if minor or patch though)

vertexData() returns only the data in ram and not the real VBO which is stored in GPU-ram. As soon as you mark it as dirty it gets completely copied into GPU. Meanwhile I have implemented a direct opengl-way where I create the VBO myself. Thanks anyway! cu