computer graphic Apply basic OpenGL commands and do the following: 1. Program us

Question

computer graphic

Apply basic OpenGL commands and do the following:
1. Program using OpenGL functions, to draw a simple shaded scene consisting of a
tea pot on a table. Define suitably the position and properties of the light source
along with the properties of the surfaces of the solid object used in the scene.
2. Program to draw a color cube and allow the user to move the camera suitably to
experiment with perspective viewing. Use OpenGL functions.
3. Design a 2D car with simple polygon. Give motion to the car.

Explanation / Answer

1.

/* simple shaded scene consisting of a tea pot on a table */
#include <GL/glut.h>
void wall (double thickness)
{
//draw thin wall with top = xz-plane, corner at origin
glPushMatrix();
glTranslated (0.5, 0.5 * thickness, 0.5);
glScaled (1.0, thickness, 1.0);
glutSolidCube (1.0);
glPopMatrix();
}

//draw one table leg
void tableLeg (double thick, double len)
{
glPushMatrix();
glTranslated (0, len/2, 0);
glScaled (thick, len, thick);
glutSolidCube (1.0);
glPopMatrix();
}

void table (double topWid, double topThick, double legThick, double legLen)
{
//draw the table - a top and four legs
//draw the top first
glPushMatrix();
glTranslated (0, legLen, 0);
glScaled(topWid, topThick, topWid);
glutSolidCube (1.0);
glPopMatrix();
double dist = 0.95 * topWid/2.0 - legThick/2.0;
glPushMatrix();
glTranslated (dist, 0, dist);
tableLeg (legThick, legLen);
glTranslated (0.0, 0.0, -2 * dist);
tableLeg (legThick, legLen);
glTranslated (-2*dist, 0, 2 *dist);
tableLeg (legThick, legLen);
glTranslated(0, 0, -2*dist);
tableLeg (legThick, legLen);
glPopMatrix();
}

void displaySolid (void)
{
//set properties of the surface material
GLfloat mat_ambient[] = {0.7f, 0.7f, 0.7f, 1.0f}; // gray
GLfloat mat_diffuse[] = {.5f, .5f, .5f, 1.0f};
  GLfloat mat_specular[] = {1.0f, 1.0f, 1.0f, 1.0f};
GLfloat mat_shininess[] = {50.0f};
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, mat_shininess);
//set the light source properties
GLfloat lightIntensity[] = {0.7f, 0.7f, 0.7f, 1.0f};
GLfloat light_position[] = {2.0f, 6.0f, 3.0f, 0.0f};
glLightfv (GL_LIGHT0, GL_POSITION, light_position);
glLightfv (GL_LIGHT0, GL_DIFFUSE, lightIntensity);
//set the camera
glMatrixMode (GL_PROJECTION);
glLoadIdentity();
double winHt = 1.0; //half-height of window
glOrtho (-winHt * 64/48.0, winHt*64/48.0, -winHt, winHt, 0.1, 100.0);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity();
gluLookAt (2.3, 1.3, 2.0, 0.0, 0.25, 0.0, 0.0, 1.0, 0.0);
//start drawing
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslated (0.4, 0.4, 0.6);
glRotated (45, 0, 0, 1);
glScaled (0.08, 0.08, 0.08);

glPopMatrix();
glPushMatrix();
glTranslated (0.6, 0.38, 0.5);
glRotated (30, 0, 1, 0);
glutSolidTeapot (0.08);
glPopMatrix ();
glPushMatrix();
glTranslated (0.25, 0.42, 0.35);
//glutSolidSphere (0.1, 15, 15);
glPopMatrix();
glPushMatrix();
glTranslated (0.4, 0, 0.4);
table (0.6, 0.02, 0.02, 0.3);
glPopMatrix();
wall (0.02);
glPushMatrix();
glRotated (90.0, 0.0, 0.0, 1.0);
wall (0.02);
glPopMatrix();
glPushMatrix();
glRotated (-90.0, 1.0, 0.0, 0.0);
wall (0.02);
glPopMatrix();
glFlush();
}

void main (int argc, char ** argv)
{
glutInit (&argc, argv);
glutInitDisplayMode (GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);
glutInitWindowSize (640, 480);
glutInitWindowPosition (100, 100);
glutCreateWindow ("simple shaded scene consisting of a tea pot on a
table");
glutDisplayFunc (displaySolid);
glEnable (GL_LIGHTING);
glEnable (GL_LIGHT0);
glShadeModel (GL_SMOOTH);
glEnable (GL_DEPTH_TEST);
glEnable (GL_NORMALIZE);
glClearColor (0.1, 0.1, 0.1, 0.0);
glViewport (0, 0, 640, 480);
glutMainLoop();
}

Hope you understand. Thanks

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