I was using DevIL to load a ppm image which was rendered by a ray tracer. For testing purpose I set up a project only for presenting the image. Image loading was fine, however what the glut windows showed was only blank stuff. Can someone please tell how to fix this problem? Thanks! Please see include code: In displayImage.cpp: ILboolean displayImage::Setup() { glEnable (GL_TEXTURE_2D); glMatrixMode (GL_PROJECTION); glLoadIdentity (); ilutRenderer (ILUT_OPENGL); TexID = ilutGLBindTexImage(); ilDeleteImages(1, &ImgId); glOrtho(0, m_iWidth, m_iHeight, 0, -1, 1); // Set up an orthographic projection with OpenGL. return IL_TRUE; } void displayImage::CleanUp( void ) { if (!bCleaned) glDeleteTextures (1, &TexID); bCleaned = IL_TRUE; } void displayImage::loadImage( char *cFileName ) { m_cFileName = cFileName; if (ilGetInteger(IL_VERSION_NUM) < IL_VERSION || iluGetInteger(ILU_VERSION_NUM) < ILU_VERSION || ilutGetInteger(ILUT_VERSION_NUM) < ILUT_VERSION) { printf ("DevIL library is out of date! Please upgrade\n"); } ilInit (); ilEnable (IL_CONV_PAL); ilutEnable (ILUT_OPENGL_CONV); ilGenImages (1, &ImgId); ilBindImage (ImgId); if (!ilLoadImage (m_cFileName)) { HandleDevILErrors (); } m_iWidth = ilGetInteger (IL_IMAGE_WIDTH); m_iHeight = ilGetInteger (IL_IMAGE_HEIGHT); if (m_iWidth > 0) { if (m_iWidth > MAX_X) { m_iWidth = MAX_X; m_iHeight = (ILuint)(MAX_X / (ILfloat)ilGetInteger(IL_IMAGE_WIDTH) * m_iHeight); } } if (m_iHeight > 0) { if (m_iHeight > MAX_Y) { m_iHeight = MAX_Y; m_iWidth = (ILuint)(MAX_Y / (ILfloat)ilGetInteger(IL_IMAGE_HEIGHT) * m_iWidth); } } HandleDevILErrors (); } void displayImage::drawImage() { glClear(GL_COLOR_BUFFER_BIT); glBindTexture (GL_TEXTURE_2D, TexID); glBegin (GL_QUADS); glTexCoord2f (0.0f, 0.0f); glVertex3i (0, 0, 0); glTexCoord2f (1.0f, 0.0f); glVertex3i (m_iWidth, 0, 0); glTexCoord2f (1.0f, 1.0f); glVertex3i (m_iWidth, m_iHeight, 0); glTexCoord2f (0.0f, 1.0f); glVertex3i (0, m_iHeight, 0); glEnd(); } ******************************************************************** In main.cpp: void init( int argc, char* * argv ) { glutInit (&argc, argv); glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE); glutInitWindowPosition (100, 100); glutInitWindowSize (640, 480); } void DisplayFunc() { display.loadImage("out.ppm"); if (display.Setup() == IL_FALSE) { cout << "Display could not be set up!" << endl; exit; } display.drawImage(); glutSwapBuffers(); } int main(int argc, char* argv[]) { init(argc, argv); Window = glutCreateWindow("Shanshan's Display Test"); glutDisplayFunc(DisplayFunc); glutKeyboardFunc (KeyboardFunc); glutMainLoop(); display.CleanUp(); return 0; }