OpenGL Lighting and Material Error When Switching Between Different Scenes - opengl

Question

I write a switch structure below to choose different scenes. For each case with a different scene, I enable something like lights, color material and depth test while I also disable them respectively in the end of this case. However, when switching between those scenes, something come wrong. Like, if I go to scene 3 first then go to scene 1, scene 1 seems affected by something extra from scene 3, such as unexpected light and material property would appear in scene 1.
Since I use different LIGHT in each scene, I don't think it's caused by lighting. However, I failed to see anything wrong in the material setting.
Could anyone give me some hint?
switch(m_iSceneNum)
{
case 1:
glClearColor(0, 0, 0, 1);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, fNoLight);
glLightfv(GL_LIGHT1, GL_AMBIENT, fLowLight);
glLightfv(GL_LIGHT1, GL_DIFFUSE, fBrightLight);
glLightfv(GL_LIGHT1, GL_SPECULAR, fBrightLight);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT1);
glEnable(GL_COLOR_MATERIAL);
glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
glMateriali(GL_FRONT, GL_SHININESS, 128);
glMaterialfv(GL_FRONT, GL_SPECULAR, fSpec);
////////////////////////////////////////////////////////
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60, 1, 1, 4000);
gluLookAt(0, 0 , 50.0f ,0.0f, 0.0f , 0.0f , 0.0f , 1.0f , 0.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glLightfv(GL_LIGHT1, GL_POSITION, fLightPos1);
glLightfv(GL_LIGHT1, GL_SPOT_DIRECTION, fLightDirection1);
glLightfv(GL_LIGHT1, GL_SPOT_CUTOFF, fLightCutoff1);
glColor3f(1,0,0);
glBegin(GL_QUADS);
glVertex3f(-10, 10, -10);
glVertex3f(10, 10, -10);
glVertex3f(10, -10, 10);
glVertex3f(-10, -10, 10);
glEnd();
glDisable(GL_COLOR_MATERIAL);
glDisable(GL_LIGHT1);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
glFlush();
break;
case 3:
glClearColor(0, 0, 0, 1);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, fNoLight);
glLightfv(GL_LIGHT3, GL_AMBIENT, fLowLight);
glLightfv(GL_LIGHT3, GL_DIFFUSE, fBrightLight);
glLightfv(GL_LIGHT3, GL_SPECULAR, fBrightLight);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT3);
glEnable(GL_COLOR_MATERIAL);
glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
glMaterialfv(GL_FRONT, GL_SPECULAR, fSpec);
glMateriali(GL_FRONT, GL_SHININESS, 0);
////////////////////////////////////////////////////////
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60, 1, 1, 4000);
gluLookAt(0, 0, 10.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glLightfv(GL_LIGHT3, GL_POSITION, fLightPos3);
glRotatef(m_fAngle, 0, 0, 1);
glBegin(GL_TRIANGLES);
glColor3f(1,0,0);
glNormal3f(0, 0, -1);
glVertex3f(0, 5, 0);
glColor3f(0,1,0);
glNormal3f(1, 1 ,1);
glVertex3f(5, 0, 0);
glColor3f(0,0,1);
glNormal3f(0, 1, 1);
glVertex3f(-5, 0, 0);
glEnd();
glDisable(GL_LIGHT3);
glDisable(GL_LIGHTING);
glDisable(GL_COLOR_MATERIAL);
glDisable(GL_DEPTH_TEST);
glFlush();
break;
default:
break;
}

Answer 1

You never provide normal(s) for the quad in case 1.
So you'll get the default normal (if case 1 is the first/only thing executed) or the last normal you set in case 3.
It's as if you're assuming glEnd() resets the current normal to the default somehow. It doesn't.