   What one earth is going on with this ligthing??
  Hey guys,I'm using - i guess you would call it "standard" lighting, based on the tutorial in the OpenGL redbook ( first lighting tutorial ). Anyway, some weird thing is happening where the light "twitches" so to speak on some of the faces on my 3ds model. One second it's lit shadowy, the next second it's brightly lit. I have no idea what is going on, and i'd like some help :)ThanksMike   
  Could you post the code where you set up the lighting? [smile]Though I have heard too much specular lighting described that way before, so it might be a good idea to temporarily reduce or disable it to make sure.Edit: Try these lighting settings:GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };GLfloat light_specular[] = { 0.0, 0.0, 0.0, 1.0 };GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);glLightfv(GL_LIGHT0, GL_POSITION, light_position);I just looked and noticed that the very first lighting settings code in the Red Book was pure specular lighting. If the above gets rid of the effect, try adjusting the 0.0 values in light_specular upwards also to see where you like it.- Pete   ;  Well a link to a picture of it would be good, but it sounds like you could be  having issues with the face normals.Show the code where you load/create the normals for the model, and the code where you draw it.   ;  Oh, i just figured out the problem. My light was positioned at x = 0.0f , that's way caused the twitching   