Wednesday, May 9, 2012

Rendering Cones glutSolidCone and glutWireCone using GLUT in C

GLUT provides function glutSolidCone to render a Solid Cone and glutWireCone to render a Wire Frame Cone. glutSolidCone and glutWireCone render a solid or wireframe cone respectively oriented along the Z axis. The base of the cone is placed at Z = 0, and the top at Z = height. The cone is subdivided around the Z
axis into slices, and along the Z axis into stacks. Here are the syntax of both the above functions

void glutSolidCone (GLdouble base, GLdouble height, GLint slices, GLint stacks);
void glutWireCone (GLdouble base, GLdoube height, GLint slices, GLint stacks);

Where, base –> The radius of base of the  cone, height –> height of the cone,  slices –> The number of subdivision around the Z-axis and stacks –> The number of subdivisions along the Z-axis.

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(0.0,0.5,-6);         glRotated(65, -1.0, 0.0, 0.0);         glutSolidCone(1, 2, 50, 50);     glPopMatrix();
    glPushMatrix();         glTranslated(0.0,-1.2,-6);         glutWireCone(1,2, 16, 16);     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 Cones");
    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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