pointRendering.cpp

//...
vtkPolyData *polyData = vtkPolyData::New();
vtkPoints *points = vtkPoints::New();
//...
points->InsertPoint(count, p[0],p[1],p[2]); // I add several points inside a loop with this function
//...
polyData->SetPoints(points);
points->Delete();
app->addPolyDataRepresentation(polyData, app->shaderProgram());
std::vector<vesSharedPtr<vesActor> > actors = app->renderer()->sceneActors();
// Since it's the second actor added to the scene I call the functions on top of actors[1]
actors[1]->mapper()->setColor(1, 0, 0, 1); // This works
actors[1]->mapper()->setPointSize(3); // This doesn't work
//...