Drawing Octahedron using openGL

Sun Feb 19, 2012 10:23 pm

Drawing Octahedron using OpenGL/GLU library and also with animated rotation . glutSolidOctahedron() function is used.

Code:: #include <GL\glut.h> GLfloat xRotated, yRotated, zRotated; // Octahedron void displayOctahedron(void) { glMatrixMode(GL_MODELVIEW); // clear the drawing buffer. glClear(GL_COLOR_BUFFER_BIT); // clear the identity matrix. glLoadIdentity(); // traslate the draw by z = -4.0 // Note this when you decrease z like -8.0 the drawing will looks far , or smaller. glTranslatef(0.0,0.0,-4.5); // Red color used to draw. glColor3f(0.8, 0.2, 0.1); // changing in transformation matrix. // rotation about X axis glRotatef(xRotated,1.0,0.0,0.0); // rotation about Y axis glRotatef(yRotated,0.0,1.0,0.0); // rotation about Z axis glRotatef(zRotated,0.0,0.0,1.0); // scaling transfomation glScalef(1.0,1.0,1.0); // built-in (glut library) function , draw you a Octahedron. glutSolidOctahedron(); // Flush buffers to screen glFlush(); // sawp buffers called because we are using double buffering // glutSwapBuffers(); } void reshapeOctahedron(int x, int y) { if (y == 0 || x == 0) return; //Nothing is visible then, so return //Set a new projection matrix glMatrixMode(GL_PROJECTION); glLoadIdentity(); //Angle of view:40 degrees //Near clipping plane distance: 0.5 //Far clipping plane distance: 20.0 gluPerspective(40.0,(GLdouble)x/(GLdouble)y,0.5,20.0); glViewport(0,0,x,y); //Use the whole window for rendering } void idleOctahedron(void) { yRotated += 0.03; displayOctahedron(); } int main (int argc, char **argv) { //Initialize GLUT glutInit(&argc, argv); //double buffering used to avoid flickering problem in animation glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); // window size glutInitWindowSize(400,350); // create the window glutCreateWindow("Octahedron Rotating Animation"); glPolygonMode(GL_FRONT_AND_BACK,GL_LINE); xRotated = yRotated = zRotated = 30.0; xRotated=33; yRotated=40; glClearColor(0.0,0.0,0.0,0.0); //Assign the function used in events glutDisplayFunc(displayOctahedron); glutReshapeFunc(reshapeOctahedron); glutIdleFunc(idleOctahedron); //Let start glut loop glutMainLoop(); return 0; }

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Drawing Octahedron using openGL

Drawing Octahedron using openGL

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