Program 4: Write a program to implement 3D Geometric Transformations.

PROGRAM 4: 3D

·         Header File

·         Render func

·         Handle resize

·         Display

·         Timer

·         Main func

1.      Header File.(gl/glut.h , math.h, windows.h) // REFER 2d link: http://simplifiedopengl.blogspot.in/2016/08/program-3-write-program-to-implement-2d.html

2.      Initialise rendering function for the 2d object// REFER 2d

3.      Create Handle Resize // REFER 2d

4.      Display Function // REFER 2d

void drawScene()

{

    glClearColor(0.0f, 0.0f, 1.0f, 0.0f);//dark blue

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    glRotatef(_angle,0.0f,0.0f,1.0f); //rotate object by 30 degree with respect to y-axis

    glTranslatef(0.0f, 0.0f, -10.0f);

    //************************

      //OBJ

//Right face (x = 1.0f), Left face (x = -1.0f), Back face (z = -1.0f), Front face  (z = 1.0f), Bottom face (y = -1.0f), top face(z=1.0f)

glutSwapBuffers();

}

5.      Timer

6.      Main Function

SAMPLE PROGRAM: 4 3D

//header file same as all

GLfloat angleCube = 0.0f;     // Rotational angle for cube [NEW]

void initRendering() {

   glEnable(GL_DEPTH_TEST);   // Enable depth testing for z-culling

}

void handleResize(int w,int h)

{

glViewport(0,0,w,h);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

gluPerspective(45.0,(double)w/(double)h,1.0,200.0);

}

void display() {

   glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Set background color to black and opaque

   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear color and depth buffers

   glMatrixMode(GL_MODELVIEW);     // To operate on model-view matrix

   glLoadIdentity();                 // Reset the model-view matrix

   glTranslatef(-1.5f, 0.0f, -6.0f);  // Move right and into the screen

   glRotatef(angleCube, 0.0f, 1.0f, 1.0f);  // Rotate about (1,1,1)-axis [NEW]

   glBegin(GL_QUADS);                // Begin drawing the color cube with 6 quads

      glColor3f(0.0f, 1.0f, 0.0f);     // Green

      glVertex3f( 1.0f, 1.0f, -1.0f);

      glVertex3f(-1.0f, 1.0f, -1.0f);

      glVertex3f(-1.0f, 1.0f,  1.0f);

      glVertex3f( 1.0f, 1.0f,  1.0f);

      // Bottom face (y = -1.0f)

    glColor3f(1.0f, 1.0f, 0.0f);     // Yellow

      glVertex3f( 1.0f, -1.0f,  1.0f);

      glVertex3f(-1.0f, -1.0f,  1.0f);

      glVertex3f(-1.0f, -1.0f, -1.0f);

      glVertex3f( 1.0f, -1.0f, -1.0f);

      // Front face  (z = 1.0f)

      glColor3f(1.0f, 0.0f, 0.0f);     // Red

      glVertex3f( 1.0f,  1.0f, 1.0f);

      glVertex3f(-1.0f,  1.0f, 1.0f);

      glVertex3f(-1.0f, -1.0f, 1.0f);

      glVertex3f( 1.0f, -1.0f, 1.0f);

      // Back face (z = -1.0f)

      glColor3f(1.0f, 1.0f, 0.0f);     // Yellow

      glVertex3f( 1.0f, -1.0f, -1.0f);

      glVertex3f(-1.0f, -1.0f, -1.0f);

      glVertex3f(-1.0f,  1.0f, -1.0f);

      glVertex3f( 1.0f,  1.0f, -1.0f);

      // Left face (x = -1.0f)

      glColor3f(0.0f, 0.0f, 1.0f);     // Blue

      glVertex3f(-1.0f,  1.0f,  1.0f);

      glVertex3f(-1.0f,  1.0f, -1.0f);

      glVertex3f(-1.0f, -1.0f, -1.0f);

      glVertex3f(-1.0f, -1.0f,  1.0f);

      // Right face (x = 1.0f)

      glColor3f(1.0f, 0.0f, 1.0f);     // Magenta

      glVertex3f(1.0f,  1.0f, -1.0f);

      glVertex3f(1.0f,  1.0f,  1.0f);

      glVertex3f(1.0f, -1.0f,  1.0f);

      glVertex3f(1.0f, -1.0f, -1.0f);

   glEnd();  // End of drawing color-cube

    glutSwapBuffers();  // Swap the front and back frame buffers (double buffering)

    angleCube -= 0.15f;

}

void update(int value) {

    angleCube+=2.0f;

    if(angleCube>360.f)

    {

    angleCube-=360;

    }

    glutPostRedisplay();

    glutTimerFunc(25,update,0);

}

int main(int argc, char** argv) {

   glutInit(&argc, argv);            // Initialize GLUT

   glutInitDisplayMode(GLUT_DOUBLE); // Enable double buffered mode

   glutInitWindowSize(640, 480);   // Set the window's initial width & height

   glutInitWindowPosition(50, 50); // Position the window's initial top-left corner

   glutCreateWindow("PROGRAM4");          // Create window with the given title

   glutDisplayFunc(display);       // Register callback handler for window re-paint event

   glutReshapeFunc(handleResize);       // Register callback handler for window re-size event

   initRendering();                       // Our own OpenGL initialization

   glutTimerFunc(0, update, 0);     // First timer call immediately [NEW]

   glutMainLoop();                 // Enter the infinite event-processing loop

   return 0;

}