Thread: OpenGL graphics

Hi,

I'm having trouble getting around what everything means in the lighting and section of OpenGL. I have managed to get lighting working, but whatever i try for shading doesn't work. I've been working of tutorials but can't make much sense of it. If anybody could help me understand whats going on and how to get shading working would be great. Ive got comments on my code which is as far as i understand.

Code:

void glutInit(int argc, char ** argv) 
{
  	// Setup the basic GLUT stuff
  	
	glutInit(&argc, argv); 						// initialises environment
  	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); 	// uses a double buffer - colour mode - 

  	// Create the window
  
	glutInitWindowSize(200, 200); 					// creates the window size
  	glutInitWindowPosition(100, 150);  				// position of the window on the screen
  	glutCreateWindow("3D Draughts");

	// Register the event callback functions
  
	glutDisplayFunc(Display); 					// called everytime it needs to refresh the display
	glutIdleFunc(idle); 						// called when it isnt doing anything


	
  	glutKeyboardFunc(KeyboardHandler);         			// picks up keyboard strokes
	glutSpecialFunc(SpecKeyHandler);
	
	glutMouseFunc(processMouse);					// mouse movement and clicks
	glutMotionFunc(processMouseActiveMotion);



	glutReshapeFunc(Reshape); 					// called everytime it needs to reshape something

	orientMe();

	glClearDepth(1.0f);

	glShadeModel(GL_SMOOTH);
	glEnable(GL_DEPTH_TEST);					// Enabling depth test
	glEnable(GL_COLOR_MATERIAL);					// Allows colored materials to be affected by the light
  	glEnable(GL_LIGHTING);		// Enable lighting
	

	glEnable(GL_LIGHT0);						// Enable 1st light, possible 8 - max
	glLightfv(GL_LIGHT0, GL_POSITION, LightPos);			// set light position
  	glLightfv(GL_LIGHT0, GL_DIFFUSE, LightColor);			// setting diffuse colour
  	glLightfv(GL_LIGHT0, GL_SPECULAR, LightColor);			// setting specular colour

									// At this point, control is relinquished to the GLUT event handler.
  	glutMainLoop();   						// Control is returned as events occur, via the callback functions.
   
}

thanks

lol, checkers?? we call it draughts... well 'they'..... i just want simple shadows so you can tell its 3D, from far, atm sometimes it looks 2.

I tried what psychopath suggested, but no luck. I didnt make up my shapes of polygons, i'm not on that level, i simply stuck together 2D shapes to make 3D shapes. I just want simple shadows now, so it adds to the realism. My light is shining from the top, and when you move the camera through it to the bottom side, it is dark. Maybe my positionbing of my light is incorrent??

Code:

const GLfloat LightPos[] = { 0.0, 0.0, 1.0, 0.0 };
const GLfloat LightColor[] = {  1.0f, 1.0f,1.0f, 1.0f };

There is no integrated support for shadows in OpenGL. You need to do the calculations yourself.

For something simple like checkers, you could just render a simple dark circle under each piece offset by a constant factor.

i see, what about shading on the peices ??