Membuat Teapot
Kali ini Saya akan memberikan source kode untuk membuat teapot dalam aplikasi Microsoft Visual C++.berikut ini adalah source codenya
#include <math.h>
#include <stdio.h>
#include <GL\glut.h>
double rx = 0.0;
double ry = 0.0;
float l[] = { 0.0, 80.0, 0.0 }; // koordinat sumber cahaya
float n[] = { 0.0, -1.0, 0.0 };
float e[] = { 0.0, -60.0, 0.0 };
// obyek yang akan digambar draw()
void draw()
{
glutSolidTeapot(40.0);
//glutSolidSphere(40, 16, 16);
//glutSolidCube (40);
//Isi dengan salah satu saja (cetak merah tebal), dan berilah obyek yang selain dalam tabel ini
}
//membuat proyeksi bayangan
void glShadowProjection(float * l,float * e,float * n)
{
float d, c;
float mat[16];
d = n[0]*l[0] + n[1]*l[1] + n[2]*l[2];
c = e[0]*n[0] + e[1]*n[1] + e[2]*n[2] - d;
mat[0] = l[0]*n[0]+c; // membuat matrik. OpenGL menggunakan kolom matrik
mat[4] = n[1]*l[0];
mat[8] = n[2]*l[0];
mat[12] = -l[0]*c-l[0]*d;
mat[1] = n[0]*l[1];
mat[5] = l[1]*n[1]+c;
mat[9] = n[2]*l[1];
mat[13] = -l[1]*c-l[1]*d;
mat[2] = n[0]*l[2];
mat[6] = n[1]*l[2];
mat[10] = l[2]*n[2]+c;
mat[14] = -l[2]*c-l[2]*d;
mat[3] = n[0];
mat[7] = n[1];
mat[11] = n[2];
mat[15] = -d;
glMultMatrixf(mat); // kalikan matrik
}
void render()
{
glClearColor(0.0,0.6,0.9,0.0);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLightfv(GL_LIGHT0, GL_POSITION, l);
glDisable(GL_CULL_FACE);
glDisable(GL_LIGHTING);
glColor3f(5.0,1.5,9.7);
glBegin(GL_POINTS);
glVertex3f(l[0],l[1],l[2]);
glEnd();
glColor3f(8.5,0.5,9.5);
glBegin(GL_QUADS);
glNormal3f(0.0,1.0,0.0);
glVertex3f(-1300.0,e[1]-0.1, 1300.0);
glVertex3f( 1300.0,e[1]-0.1, 1300.0);
glVertex3f( 1300.0,e[1]-0.1,-1300.0);
glVertex3f(-1300.0,e[1]-0.1,-1300.0);
glEnd();
// gambar bayangan
glPushMatrix();
glRotatef(ry,0,2,0);
glRotatef(rx,2,0,0);
glEnable(GL_LIGHTING);
glColor3f(0.0,0.0,0.8);
draw();
glPopMatrix();
//sekarang gambar bayangan yang muncul
glPushMatrix();
glShadowProjection(l,e,n);
glRotatef(ry,0,1,0);
glRotatef(rx,1,0,0);
glDisable(GL_LIGHTING);
glColor3f(0.2,0.2,0.2);
draw();
glPopMatrix();
glutSwapBuffers();
}
void help()
{
printf("08_Dedy Kusuma_XIIRA\n");
}
void keypress(unsigned char c, int a, int b)
{
switch (c){
case 's':
l[1]-=5.0;
break;
case 'w':
l[1]+=5.0;
break;
case 'a':
l[0]-=5.0;
break;
case 'd':
l[0]+=5.0;
break;
case 'q':
l[2]-=5.0;
break;
case 'e':
l[2]+=5.0;
break;
case 'h':
help();
break;
}
}
void idle()
{
rx+=0.4;
ry+=0.7;
render();
}
void resize(int w,int h)
{
glViewport(0, 0, w, h);
}
int main(int argc,char * argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutCreateWindow("proyeksi bayangan");
glutReshapeFunc(resize);
glutReshapeWindow(400,400);
glutKeyboardFunc(keypress);
glutDisplayFunc(render);
glutIdleFunc(idle);
glEnable(GL_NORMALIZE);
glEnable(GL_LIGHTING);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHT0);
glEnable(GL_TEXTURE_2D);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0f, 1.0, 1.0, 400.0);
// Reset koordinat sebelum dimodifikasi/diubah
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -150.0);
glutMainLoop();
return 0;
}
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