7. 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 properties of the surfaces of the solid object used in the scene.

Description:

Lighting and shading play a very prominent role in the field of image formation process, there are various graphics shading models supported by openGL. In this program the programmer should develop a simple

Scene consisting of table and a teapot and demonstrate the different effects of lighting and shading.

Program:

#include<GL/glut.h>

void displaySolid(void)

{

            glClearColor(0.5,0.5,0.1,0.0);

            glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

            glMatrixMode(GL_PROJECTION);

            glLoadIdentity();

            glOrtho(-100,100,-100,100,-100,100);

            glMatrixMode(GL_MODELVIEW);

            glLoadIdentity();

            //set properties of the surface material

            GLfloat mat_ambient[]={0.0f,1.0f,1.0f,1.0f};

            GLfloat mat_diffuse[]={1.0f,0.5f,1.0f,1.0f};

            GLfloat mat_specular[]={0.5f,0.5f,1.0f,1.0f};

            GLfloat mat_shininess[]={25.0f};

            glMaterialfv(GL_FRONT_AND_BACK,GL_AMBIENT,mat_ambient);

            glMaterialfv(GL_FRONT_AND_BACK,GL_DIFFUSE,mat_diffuse);

            glMaterialfv(GL_FRONT_AND_BACK,GL_SPECULAR,mat_specular);

            glMaterialfv(GL_FRONT_AND_BACK,GL_SHININESS,mat_shininess);

            //set the light source properties

            GLfloat lightIntensity[]={1.0f,0.7f,0.7f,1.0f};

            GLfloat light_position[]={25.0f,50.0f,50.0f,1.0f};

            glLightfv(GL_LIGHT0, GL_POSITION,light_position);

            glLightfv(GL_LIGHT0,GL_DIFFUSE,lightIntensity);

            glPushMatrix();

            glTranslated(0,30,0);

            glRotatef(35,1,0.5,0);

            //glScaled(1,8,1);

            glutSolidTeapot(10);

            //glutWireTeapot(10);

            glPopMatrix();

           

            GLfloat mat_ambient1[]={1.0f,0.0f,0.0f,1.0f};

            GLfloat mat_diffuse1[]={1.0f,1.0f,0.0f,1.0f};

            GLfloat mat_specular1[]={1.0f,1.0f,0.5f,1.0f};

            GLfloat mat_shininess1[]={25.0f};

            glMaterialfv(GL_FRONT_AND_BACK,GL_AMBIENT,mat_ambient1);

            glMaterialfv(GL_FRONT_AND_BACK,GL_DIFFUSE,mat_diffuse1);

            glMaterialfv(GL_FRONT_AND_BACK,GL_SPECULAR,mat_specular1);

            glMaterialfv(GL_FRONT_AND_BACK,GL_SHININESS,mat_shininess1);

            //set the light source properties

            GLfloat lightIntensity1[]={0.5f,0.5f,0.5f,1.0f};

            GLfloat light_position1[]={25.0f,50.0f,50.0f,1.0f};

            glLightfv(GL_LIGHT0, GL_POSITION,light_position1);

            glLightfv(GL_LIGHT0,GL_DIFFUSE,lightIntensity1);

            //top surface

            glPushMatrix();

            glTranslated(0,20,0);

            glRotatef(-80,1,0.5,0.8);

            //glRotatef(,0,0,1);

            glScalef(1.5,1.5,0.1);

            glutSolidCube(50);

            glPopMatrix();

            //First Leg

            glPushMatrix();

            glTranslated(-45,-10,-5);

            glRotatef(45,0,1,0);

            glScalef(0.4,5.5,0.4);

            glutSolidCube(10);

            glPopMatrix();

            //Second Leg

            glPushMatrix();

            glTranslated(-10,-25,5);

            glRotatef(45,0,1,0);

            glScalef(0.4,4.5,0.4);

            glutSolidCube(10);

            glPopMatrix();

            //Third Leg

            glPushMatrix();

            glTranslated(45,-5,-10);

            glRotatef(45,0,1,0);

            glScaled(0.4,5.5,0.4);

            glutSolidCube(10);

            glPopMatrix();

            //Fourth Leg

            glPushMatrix();

            glTranslated(10,5,-35);

            glRotatef(45,0,1,0);

            glScalef(0.4,6,0.4);

            glutSolidCube(10);

            glPopMatrix();

            glFlush();

}

void main(int argc, char *argv[])

{

            glutInit(&argc,argv);

            glutInitWindowSize(600,600);

            glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);

            glutInitWindowPosition(10,10);

            glutInitWindowSize(500,500);

            glutCreateWindow("Simple shaded scene consisting of a tea pot on a table");

            glutDisplayFunc(displaySolid);

            glEnable(GL_LIGHTING); // enable Lighting

            glEnable(GL_LIGHT0);  // enable the light source

            glShadeModel(GL_SMOOTH); // set the shading model GL_FLAT or GL_SMOOTH

            glEnable(GL_DEPTH_TEST);

            glEnable(GL_NORMALIZE);

            glutMainLoop();

}