Thursday, May 10, 2012

Rendering Teapot glutSolidTeapot and glutWireTeapot using GLUT in C

GLUT provides function glutSolidTeapot to render a Solid Torus and glutWireTeapot to render a Wire Frame Torus. glutSolidTeapot and glutWireTeapot render a solid or wireframe teapot respectively. Both surface normals and texture coordinates for the teapot are generated. The teapot is generated with OpenGL evaluators. Here are the syntax of both the above functions

void glutSolidTeapot (GLdouble size);
void glutWireTeapot(GLdouble size);

Where, size –> Relative size of Teapot

Source Code
#include <windows.h>
#include <GL/glut.h>
#include <stdlib.h> 
static void resize(int width, int height) {     const float ar = (float) width / (float) height;
    glViewport(0, 0, width, height);     glMatrixMode(GL_PROJECTION);     glLoadIdentity();     glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);
    glMatrixMode(GL_MODELVIEW);     glLoadIdentity() ; }
static void display(void) {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);     glColor3d(0,1,0);
    glPushMatrix();         glTranslated(0.0, 1.5, -6);         glRotated(30, 0.0, -1.0, 0.0);         glutSolidTeapot(1);     glPopMatrix();
    glColor3d(1, 0, 0);     glPushMatrix();         glTranslated(0.0, -1.2, -6.0);         glutWireTeapot(1);     glPopMatrix();     glutSwapBuffers(); }
const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f }; const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f }; const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f }; const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };
const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f }; const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f }; const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f }; const GLfloat high_shininess[] = { 100.0f };
/* Program entry point */
int main(int argc, char *argv[]) {     glutInit(&argc, argv);     glutInitWindowSize(640,480);     glutInitWindowPosition(10,10);     glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("Programming Techniques - 3D Teapots");
    glutReshapeFunc(resize);     glutDisplayFunc(display);
    glClearColor(1,1,1,1);     glEnable(GL_CULL_FACE);     glCullFace(GL_BACK);
    glEnable(GL_DEPTH_TEST);     glDepthFunc(GL_LESS);
    glEnable(GL_LIGHT0);     glEnable(GL_NORMALIZE);     glEnable(GL_COLOR_MATERIAL);     glEnable(GL_LIGHTING);
    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);     glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);     glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);     glLightfv(GL_LIGHT0, GL_POSITION, light_position);
    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);     glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);     glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);     glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
    return EXIT_SUCCESS; }



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