Thursday, May 10, 2012

Rendering Torus glutSolidTorus and glutWireTorus using GLUT in C

GLUT provides function glutSolidTorus to render a Solid Torus and glutWireTorus to render a Wire Frame Torus. glutSolidTorus and glutWireTorus render a solid or wireframe torus (doughnut) respectively centered at the modeling coordinates origin whose axis is aligned with the Z axis. Here are the syntax of both the above functions

void glutSolidTorus (GLdouble innerRadius, GLdouble outerRadius, GLint nsides, GLint rings);
void glutWireTorus (GLdouble innerRadius, GLdouble outerRadius, GLint nsides, GLint rings);

Where, innerRadius –> Inner Radius of the Torus, outerRadius –> Outer Radius of the Torus,  nsides –> Number of sides for each radial section, rings –> Number of radial divisions for torus.

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(1,0,0);
    glPushMatrix();         glTranslated(0.0,1.5,-6);         glRotated(-10, 1.0, 0.0, 0.0);         glutSolidTorus(0.4, 0.8, 10, 50);     glPopMatrix();
    glPushMatrix();         glTranslated(0.0,-1.2,-6);         glutWireTorus(0.4, 0.8, 10, 20);     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 Torus");
    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);
    glutMainLoop();
    return EXIT_SUCCESS; }

Output

GLUTTorus

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