working with openGL - opengl

Question

im trying to do a little 3d scene with openGL and include a bit of lighting, im fine with my scene (although it isnt anything special) and im trying to add some lighting to give it some effect. however I can add material to my podium (which isnt textured) and that gives me light and anything that IS textured does not apply any material to it so it defies the point of having lights. Heres some of the code.
// Setup GL_LIGHT0
glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmbient); // Setup ambient light
glLightfv(GL_LIGHT0, GL_DIFFUSE, lightDiffuse); // Setup diffuse light
glLightfv(GL_LIGHT0, GL_SPECULAR, lightSpecular); // Setup specular light
glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, ca);
glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, la);
glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, qa);
glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 180.0f);
glLightf(GL_LIGHT0, GL_SPOT_EXPONENT, 0.0);
// Setup GL_LIGHT1
glLightfv(GL_LIGHT1, GL_AMBIENT, lightAmbient); // Setup ambient light
glLightfv(GL_LIGHT1, GL_DIFFUSE, lightDiffuse); // Setup diffuse light
glLightfv(GL_LIGHT1, GL_SPECULAR, lightSpecular); // Setup specular light
glLightf(GL_LIGHT1, GL_CONSTANT_ATTENUATION, ca);
glLightf(GL_LIGHT1, GL_LINEAR_ATTENUATION, la);
glLightf(GL_LIGHT1, GL_QUADRATIC_ATTENUATION, qa);
glLightf(GL_LIGHT1, GL_SPOT_CUTOFF, 180.0f);
glLightf(GL_LIGHT1, GL_SPOT_EXPONENT, 0.0);
// Setup GL_LIGHT2
glLightfv(GL_LIGHT2, GL_AMBIENT, lightAmbient); // Setup ambient light
glLightfv(GL_LIGHT2, GL_DIFFUSE, lightDiffuse); // Setup diffuse light
glLightfv(GL_LIGHT2, GL_SPECULAR, lightSpecular); // Setup specular light
glLightf(GL_LIGHT2, GL_CONSTANT_ATTENUATION, ca);
glLightf(GL_LIGHT2, GL_LINEAR_ATTENUATION, la);
glLightf(GL_LIGHT2, GL_QUADRATIC_ATTENUATION, qa);
glLightf(GL_LIGHT2, GL_SPOT_CUTOFF, 180.0f);
glLightf(GL_LIGHT2, GL_SPOT_EXPONENT, 0.0);
// Setup GL_LIGHT3
glLightfv(GL_LIGHT3, GL_AMBIENT, lightAmbient); // Setup ambient light
glLightfv(GL_LIGHT3, GL_DIFFUSE, lightDiffuse); // Setup diffuse light
glLightfv(GL_LIGHT3, GL_SPECULAR, lightSpecular); // Setup specular light
glLightf(GL_LIGHT3, GL_CONSTANT_ATTENUATION, ca);
glLightf(GL_LIGHT3, GL_LINEAR_ATTENUATION, la);
glLightf(GL_LIGHT3, GL_QUADRATIC_ATTENUATION, qa);
glLightf(GL_LIGHT3, GL_SPOT_CUTOFF, 180.0f);
glLightf(GL_LIGHT3, GL_SPOT_EXPONENT, 0.0);
// OpenGL provides a global ambient light component - we don't want this so set to zero
GLfloat global_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, global_ambient);
And to render my room + 3d object.
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);
glEnable(GL_LIGHT2);
glEnable(GL_LIGHT3);
// Define position and direction
// NOTE: Placing these commands AFTER the above viewing (camera) transformations means the light position and direction appear to have a set point / direction in the 3D environment. If these commands are placed BEFORE the above viewing transformations, then the light appears to move with the camera (as if it is attached to the camera!)
glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, lightDirection);
glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
glLightfv(GL_LIGHT1, GL_SPOT_DIRECTION, lightDirection1);
glLightfv(GL_LIGHT1, GL_POSITION, lightPosition1);
glLightfv(GL_LIGHT2, GL_SPOT_DIRECTION, lightDirection2);
glLightfv(GL_LIGHT2, GL_POSITION, lightPosition2);
glLightfv(GL_LIGHT3, GL_SPOT_DIRECTION, lightDirection3);
glLightfv(GL_LIGHT3, GL_POSITION, lightPosition3);
// setup materials for objects to draw
glMaterialfv(GL_FRONT, GL_AMBIENT, ambientMaterial);
glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMaterial);
glMaterialfv(GL_FRONT, GL_SPECULAR, specularMaterial);
// 2. Draw scene
glPushMatrix();
drawRoom();
glTranslatef(0.0,-0.75,0.0);
glRotatef(90.0, 1.0,0.0, 0.0);
glRotatef(-spin, 0.0,0.0, 1.0);
glColor3f(1.0, 1.0, 1.0);
drawPodium();
glPopMatrix();
// Save transformations prior to rendering scene
glPushMatrix();
glColor3f(0.0, 0.0, 1.0);
// Setup texture state
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glRotatef(spin, 0.0,1.0, 0.0);
// Render model
glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMaterial2);
glTranslatef(0.0,0.8,0.0);
glRotatef(1.0,1.0,0.0,0.0);
myModel->renderTexturedModel();
// Reset texture state
glDisable(GL_TEXTURE_2D);
// restore transformations after rendering scene
glPopMatrix();
And the current outcome with my 4 lights, in a square shape above the helicopter all looking down towards 0.0 is:
If you can make out the white dotted lines they are the direction the lights are looking. the surface of the podium is lit and the sides of the podium are lit as it spins. However the rest of the room and helicopter does not respond to light and act like lighting isnt even enabled hence why i think its because everything except the podium is textured.

Answer 1

You need to setup glTexEnv to specify how lighting should work for the textured objects
See:
21.030 Why doesn't lighting work when I turn on texture mapping?
http://www.opengl.org/resources/faq/technical/texture.htm
Or to address your problem more directly, the line
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
is what causes the behaviour. As the faq explains, when you specify GL_REPLACE, you replace the primitive lighting colour with the texture colour, which overwrites any lighting calculations. You can remove this line completely as GL_MODULATE is the default behaviour.

Answer 2

I don't know if the above method works for you. I had the same problem. My problem was that I had not specified the normals of the object.
//specify normals
glNormal3f();
hopefully this will solve the problem for anyone (i tried every other method over the internet but nothing worked; only this method worked).