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copied!<p><strong>Please tell your teacher that he is doing it wrong!</strong> To do a animation with GLUT don't put a animation loop into the display function, but register a idle function, that reissues a display. Also this code misses a buffer swap (which is mandatory on MacOS X if not running in full screen mode, to tell the compositor you're done with rendering).</p> <p>Also you shouldn't sleep for an animation (the buffer swap will do this anyway) but measure the time between frames.</p> <hr> <h3>Update: Fixed code</h3> <pre><code>#include <OpenGL/gl.h> #include <OpenGL/glu.h> #include <GLUT/glut.h> #include <stdlib.h> #include <sys/time.h> #include <math.h> #include <stdio.h> double getftime( void ) { struct timeval tv; gettimeofday(&tv, NULL); return tv.tv_sec + tv.tv_usec*1e-6; } static double lasttime; void display( void ) { int width, height; double finishtime, delta_t; static float angle = 0; width = glutGet(GLUT_WINDOW_WIDTH); height = glutGet(GLUT_WINDOW_HEIGHT); glClearColor( 0.5, 0.5, 0.5, 1.0 ); /* combine the clearing flags for more efficient operation */ glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT ); glViewport(0, 0, width, height); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); gluPerspective( 90, (float)width/(float)height, 1, 12 ); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); gluLookAt( 0, 4, 4, 0, 0, 0, 0, 1, 0 ); glEnable( GL_DEPTH_TEST ); glRotated( angle, 1, 0, 0 ); glColor3f( 1, 0, 0 ); glutSolidSphere( 1, 20, 20 ); glColor3f( 0.8, 0.8, 0 ); glutWireSphere( 1, 20, 20 ); glColor3f( 0, 0, 1 ); glutSolidTorus( 1, 2, 40, 40 ); glDisable( GL_DEPTH_TEST ); glutSwapBuffers(); finishtime = getftime(); delta_t = finishtime - lasttime; angle = fmodf(angle + 10*delta_t, 360); lasttime = finishtime; } int main( int argc, char **argv ) { glutInit( &argc, argv ); glutInitWindowSize( 600, 600 ); /* glutInitDisplayMode must be called before glutCreateWindow, flags are prefixed with GLUT_ not GL */ glutInitDisplayMode( GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE ); glutCreateWindow( "Depth Buffer" ); glutDisplayFunc( display ); /* register glutPostRedisplay for continuous animation */ glutIdleFunc(glutPostRedisplay); lasttime = getftime(); glutMainLoop( ); } </code></pre>

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