Membuat Objek 3D di GLUT (OpenGL Utility Toolkit)

Selain bisa membuat objek primitif di GLUT (OpenGL Utility Toolkit) yang bersifat 2D, ada juga fungsi-fungsi yang digunakan untuk membuat objek dalam mode 3D (tiga dimensi). Fungsi-fungsi untuk membuat objek 3D di GLUT adalah :

• glutSolidSphere, glutWireSphere
• glutSolidCube, glutWireCube
• glutSolidCone, glutWireCone
• glutSolidTorus, glutWireTorus
• glutSolidDodecahedron, glutWireDodecahedron
• glutSolidOctahedron, glutWireOctahedron
• glutSolidTetrahedron, glutWireTetrahedron
• glutSolidIcosahedron, glutWireIcosahedron
• glutSolidTeapot, glutWireTeapot

Contoh script untuk membuat objek 3D

#include <stdlib.h>
#include <glut/glut.h>

int w = 480, h = 480, z = 0;
int x1 = 0, y1 = 0, z1 = 0, sudut = 0, size = 1;

void timer(int value) {
glutPostRedisplay();
glutTimerFunc(50,timer,0);
}

void myKeyboard(unsigned char key, int x, int y) {
if(key == 'a') z+= 5; //mendekat
else if (key == 'd') z-= 5; //menjauh
else if (key == 'x') { //rotasi sumbu x
x1 = 1;
y1 = 0;
z1 = 0;
sudut += 5;

} else if (key == 'y') { //rotasi sumbu y

x1 = 0;

y1 = 1;

z1 = 0;

sudut += 5;

} else if (key == 'z') { //rotasi sumbu z

x1 = 0;

y1 = 0;

z1 = 1;

sudut += 5;

}

}

void mySpecialKeyboard(int key, int x, int y) {

if(key == GLUT_KEY_UP) size += 1;

else if (key == GLUT_KEY_DOWN) size -= 1;

}

void init() {

glClearColor(0.0,0.0,0.0,1.0);

glEnable(GL_DEPTH_TEST);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

gluPerspective(30., (GLdouble)w/(GLdouble)h, 1., 300.);

glMatrixMode(GL_MODELVIEW);

}

void resize(int w1, int h1) {

glViewport(0,0,w1,h1);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

gluPerspective(45.0, (float)w1/(float)h1, 1.0, 300.0);

glMatrixMode(GL_MODELVIEW);

glLoadIdentity();

}

void renderScene(void) {

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glLoadIdentity();

glTranslatef(0, 0, z);

glRotatef(sudut, x1, y1, z1);

glColor3f(1, 1, 0);

glutWireTeapot(size);

glutSwapBuffers();

}

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

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);

glutInitWindowPosition(100, 100);

glutInitWindowSize(w, h);

glutCreateWindow("GRAFKOM 8");

gluOrtho2D(-w/2, w/2, -h/2, h/2);

glutDisplayFunc(renderScene);

glutTimerFunc(50, timer, 0);

glutKeyboardFunc(myKeyboard);

glutSpecialFunc(mySpecialKeyboard);

glutReshapeFunc(resize);

init();

glutMainLoop();

}

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