Normal Shader

Outside of function put

constexpr auto normalShader="normalShader";

in initializeGL put

  shader->createShaderProgram(normalShader);
  shader->attachShader("normalVertex",ngl::ShaderType::VERTEX);
  shader->attachShader("normalFragment",ngl::ShaderType::FRAGMENT);
  shader->attachShader("normalGeo",ngl::ShaderType::GEOMETRY);

  shader->loadShaderSource("normalVertex","shaders/normalVertex.glsl");
  shader->loadShaderSource("normalFragment","shaders/normalFragment.glsl");
  shader->loadShaderSource("normalGeo","shaders/normalGeo.glsl");
  shader->attachShaderToProgram(normalShader,"normalVertex");
  shader->attachShaderToProgram(normalShader,"normalFragment");
  shader->attachShaderToProgram(normalShader,"normalGeo");
  shader->compileShader("normalVertex");
  shader->compileShader("normalFragment");
  shader->compileShader("normalGeo");
  shader->linkProgramObject(normalShader);
  shader->use(normalShader);
  shader->setUniform("normalSize",0.5f );
  shader->setUniform("vertNormalColour",0.0f,0.0f,1.0f,0.0f);
  shader->setUniform("faceNormalColour",0.0f,0.0f,1.0f,0.0f);
  shader->setUniform("drawFaceNormals",1);
  shader->setUniform("drawVertexNormals",1);


In Draw put use

  m_vao->bind();
  shader->use(normalShader);
  shader->setUniform("MVP", mouseGlobalTX * m_view*m_projection);
  m_vao->draw();

  shader->use(gridShader);
  shader->setUniform("MVP", mouseGlobalTX * m_view*m_projection);
  shader->setUniform("MV", mouseGlobalTX * m_view);
  ngl::Mat3 normalMatrix= mouseGlobalTX * m_view;
  normalMatrix.inverse();
  shader->setUniform("normalMatrix",normalMatrix);



  m_vao->draw();
  m_vao->unbind();