OpenGL Teapot Program Modification | Visual Studio | Computer Graphics

Veröffentlicht am: 24 Juni 2021
auf dem Kanal: AJ Studio

913

In this video we do the modification like:
Different inbuilt shapes supported in OpenGL.

Code is here:

void wall (double thickness)// draw single wall and translate that wall everywhere.
{
//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);//moving leg
tableLeg (legThick, legLen);//1 called
glTranslated (0.0, 0.0, -2 * dist);//moving leg
tableLeg (legThick, legLen);//2 called
glTranslated (-2*dist, 0, 2 *dist);//moving leg
tableLeg (legThick, legLen);//3 called
glTranslated(0, 0, -2*dist);//moving leg
tableLeg (legThick, legLen);//4 called
glPopMatrix();
}

void displaySolid (void)//lighting effect
{
//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[] = {20.0f};
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);// 8 lighting effects//0-7
glLightfv (GL_LIGHT0, GL_DIFFUSE, lightIntensity);//GL_LIGHT0,GL_LIGHT1,GL_LIGHT2....GL_LIGHT7
//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, 10.0);
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 (0.5, 0.40, 0.5);
glRotated (30, 0, 1, 0);
//glutSolidTeapot (0.29);
//glutWireTeapot(0.29);
//glutSolidCube(0.3);
glutWireCube(0.3);
//glutSolidDodecahedron();
//glutSolidOctahedron();
//glutSolidIcosahedron();
//glutSolidTetrahedron();//opengl.org

glPopMatrix ();
glPushMatrix();
glTranslated (0.4, 0, 0.4);
table (0.6, 0.02, 0.02, 0.3);
glPopMatrix();
wall(0.02); //bottom
glPushMatrix();
glRotated (90.0, 0.0, 0.0, 1.0);
wall(0.02); //left
glPopMatrix();
glPushMatrix();
glRotated (-90.0, 1.0, 0.0, 0.0);
wall(0.02); //right
glPopMatrix();
glFlush();
}

int main (int argc, char **argv)
{
glutInit (&argc, argv);
glutInitDisplayMode (GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);
glutInitWindowSize (640, 480);
glutCreateWindow ("simple shaded scene consisting of a tea pot on a table");
glutDisplayFunc (displaySolid);
glEnable(GL_LIGHTING);//lighting effect
glEnable(GL_LIGHT0);//enabling 1 light effect
glShadeModel (GL_SMOOTH);//shading model which is smooth
glEnable (GL_DEPTH_TEST);//3d test//F B
glEnable (GL_NORMALIZE);//normalization for picture
glClearColor (0.0, 0.0, 0.0, 1.0);
glViewport (0, 0, 640, 480);
glutMainLoop();
return 0;
}

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