1. LAB 5
Drawing Objects
Lab 5
Drawing Objects

2.  Example to draw circle  Drawing Objects:
 Sphere
 Cube  Torus
 Icosahedron  Octahedron  Tetrahedron  Dodecahedron  Cone
 Teapot
 practices

3. glutCreateWindow("draw circle"); glClearColor(0.95, 0.90, 0.85, 0.0);
#include <windows.h> #include <gl\glut.h> #include <math.h>
void main(void)
#define PI }
int numPoints= 500;
int Radius =50; void draw(void)
glutInitDisplayMode(GLUT_RGB); glutInitWindowPosition(100,100); glutInitWindowSize(200,200); }
glutCreateWindow("draw circle"); glClearColor(0.95, 0.90, 0.85, 0.0);
glClear(GL_COLOR_BUFFER_BIT); glColor3f(0.0,0.6,0.6);
glutDisplayFunc(draw);
glBegin(GL_POLYGON); for (int i=0; i<numPoints; i++)
gluOrtho2D(-100.0, 100.0, , 100.0); }
glutMainLoop();
float angle = i * (2.0*PI/numPoints); float x = cos(angle)*Radius; {
float y = sin(angle)*Radius; glVertex2f(x , y); {
glEnd(); glFlush(); {

4.  The GLUT library provides several objects that are rather tedious to build. These objects are fully defined, with normal, and they are useful for experimenting with lighting. A “wire” object displays as a wire frame. A “solid” object looks like a solid, but you should define its material properties yourself.

5. GLUT provides functions for the 3D objects:  Sphere
 Cube  Torus
 Icosahedron  Octahedron  Tetrahedron  Dodecahedron  Cone
 Teapot

6.  void glutSolidSphere(GLdouble radius, GLint slices, GLint stacks);
 void glutWireSphere(GLdouble radius, GLint slices, GLint stacks);
Where:
 radius : The radius of the sphere.
 slices : The number of subdivisions around the Z axis (similar to lines of longitude).
 stacks : The number of subdivisions along the Z axis (similar to lines of latitude).

8.  glutSolidSphere(15,10,70);
 glutWireSphere(15,10,70);

10. GLdouble outerRadius, GLint nsides, GLint rings); Where:
 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 the torus.

12.  glutSolidTorus(5,10,15,50);

13. void glutSolidCube(GLdouble size); void glutWireCube(GLdouble size);

14.  GlutSolidCube(20);
 glutWireCube(20);

15.  void glutSolidCone(GLdouble base, GLdouble height, GLint slices, GLint stacks);
 void glutWireCone(GLdouble base, GLdouble height, GLint slices, GLint stacks);
Where:
 base : The radius of the base of the cone.  height :The height of the cone.
 slices : The number of subdivisions around the Z axis.
 stacks :The number of subdivisions along the Z axis.

16.  glutSolidCone(5,2,70,10);

17.  void glutSolidTeapot(GLdouble size);  void glutWireTeapot(GLdouble size); Where:
 size :Relative size of the teapot. Example:
glutSolidTeapot(10);

18.  void glutSolidIcosahedron(void); Example: glutSolidIcosahedron();  void glutWireIcosahedron(void); Example: glutWireIcosahedron();

19.  void glutSolidOctahedron(void); Example: glutSolidOctahedron ();  void glutWireOctahedron(void); Example: glutWireOctahedron ();

20.  void glutSolidTetrahedron(void); Example: glutSolidTetrahedron();  void glutWireTetrahedron(void); Example: glutWireTetrahedron();

21.  void glutSolidDodecahedron(void); Example: glutSolidDodecahedron();  void glutWireDodecahedron(void); Example: glutWireDodecahedron();

22. #include <windows.h> #include <GL/glut.h> void draw(void)}
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //glEnable(GL_DEPTH_TEST);
//glEnable(GL_LIGHTING);
//glEnable(GL_LIGHT0);
//glDisable(GL_CULL_FACE);
//glEnable(GL_COLOR_MATERIAL); glColor3ub (204,0,102);
glutSolidTeapot(10);
glFlush(); {

23. void main() }
glutInitWindowSize(200,200);
glutInitDisplayMode(GLUT_DEPTH);
glutCreateWindow("Teapot"); glutDisplayFunc(draw);
glClearColor(0.95, 0.90, 0.85, 0.0);
//glMatrixMode(GL_PROJECTION);
//glLoadIdentity();
glOrtho(-21.0, 21.0, -21.0, 21.0, -20.0, 20.0);
//glMatrixMode(GL_MODELVIEW);
//glLoadIdentity();
glutMainLoop(); {

25. Draw the following shapes: Solid Sphere glutSolidSphere (0.4, 16, 16) 1)
Solid Cube glutSolidCube (1.0) 2)
Solid cone glutSolidCone (1.0, 2.0, 3, 4); 3)
Redraw the previous objects as a wire frame.