Hi, I solved it. The problem was the “tuplasize” that I was using with the setAttributeBuffer instruction.

It was

Qt Code: 
  1. Objects[i].indexed_vertices.size() * sizeof(vertex)
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Now I changed it to 3 and started passing normals as vertices too, the result code is:

Qt Code: 
  1. void GLWidget::paintGL()
  2. {
  3.     glClearColor(0.4765625, 0.54296875, 0.6171875, 1.0);
  4.     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  5. /*
  6.     glLoadIdentity();
  7.     glTranslatef(0.0f, 0.0f, -10.0f);
  8. */
  9.  
  10.     editor->setUniformValue("projectMatrix", controller->getProjectionMatrix());
  11.     editor->setUniformValue("viewMatrix", controller->getViewMatrix());
  12.  
  13.  
  14.     /** Ahora para las operaciones especificas de cada objeto **/
  15.  
  16.     for (int i=0; i<Objects.size(); i++)
  17.     {
  18.         Objects[i].modelmatrix.scale(1.0, 1.0, 1.0);
  19.         Objects[i].modelmatrix.rotate(1.0, 0.0, 0.0, 1.0);
  20.         editor->setUniformValue("modelMatrix", Objects.at(i).modelmatrix);
  21.  
  22.         glEnableClientState(GL_VERTEX_ARRAY);
  23.         editor->enableAttributeArray("vertices");
  24.         Objects[i].vertexbuffer->bind();
  25.         //glVertexPointer(3, GL_FLOAT, 0, Objects.at(i).indexed_vertices.data());
  26.         editor->setAttributeBuffer("vertices", GL_FLOAT, 0, 3); // (PROGRAM_VERTEX_ATTRIBUTE, Objects[i].vertices.data());
  27.         //glDisableClientState(GL_VERTEX_ARRAY);
  28.  
  29.         //glEnableClientState(GL_NORMAL_ARRAY);
  30.         editor->enableAttributeArray("normals");
  31.         Objects[i].normalbuffer->bind();
  32.         //glVertexPointer(3, GL_FLOAT, 3, Objects.at(i).indexed_normals.data());
  33.         editor->setAttributeBuffer ("normals", GL_FLOAT, 0, 3);
  34.         glDisableClientState(GL_VERTEX_ARRAY);
  35.  
  36.         //glDrawArrays(GL_QUADS, 0, Objects[i].vertices.size());
  37.         Objects[i].elementbuffer->bind();
  38.         glDrawElements(GL_QUADS, Objects[i].indices.size(), GL_UNSIGNED_SHORT, (void*)0);
  39.     }
  40. }
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Consider this thread as solved