OpenGL txt File 이용해 그래픽 불러 들이기 - box

Study/OpenGL 2011. 9. 29. 10:14
8 (꼭지점의 갯수, 정수타입)
 -1.0  -1.0  1.0 
 -1.0    1.0    1.0  
  1.0    1.0    1.0  
  1.0  -1.0    1.0
 -1.0  -1.0  -1.0  
 -1.0    1.0 -1.0
  1.0   1.0  -1.0
  1.0  -1.0  -1.0

* 8개의 줄, 각각의 하나는 꼭지점의 x,y,z 값을 의미한다

6 (면의 갯수, 정수타입)
0 3 2 1
2 3 7 6
3 0 4 7
1 2 6 5
4 5 6 7
5 4 0 1

?
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#include <gl/glut.h>      
#include <stdio.h>   
#include <math.h>   
#include <iostream>
using namespace std;
 
#define PI 3.1415926  
#define M 36 
#define N 18 
 
float radius = 1;  
float theta;  
float phi; 
float delta_theta; 
float delta_phi; 
 
float cameraX = 3; 
float cameraY = 3;
float cameraZ = 3;     
 
struct POINT3D
{
    float x;
    float y;
    float z;
};
 
POINT3D *ver;
 
struct FACE4D 
{ 
    int v1;
    int v2;
    int v3;
    int v4;
}; 
 
FACE4D *face; 
int v_no;
int f_no;
 
float color[][3] =
{
    (1.0, 1.0, 1.0), //흰색
    (1.0, 0.0, 0.0), //빨강색
    (0.0, 1.0, 0.0), //초록
    (0.0, 0.0, 1.0), //파랑
    (1.0, 1.0, 0.0), //노랑
    (0.0, 1.0, 1.0), //시안
    (1.0, 0.0, 1.0), //퍼플
    (0.5, 0.5, 0.5)  //회색
};
 
void File_Load(void) //파일불러들이기
{
    char *filename;
    FILE *fp;
     
    int i;
     
    filename = "box.txt";
    fp = fopen(filename, "r");
     
    fscanf(fp, "%d", &(v_no));
    ver = new POINT3D[v_no];
    for(i=0;i<v_no;i++)
        fscanf(fp, "%f %f %f", &(ver[i].x), &(ver[i].y), &(ver[i].z));
     
    fscanf(fp, "%d", &(f_no));
    face = new FACE4D[f_no];
    for(i=0;i<f_no;i++)
        fscanf(fp, "%d %d %d %d", &(face[i].v1), &(face[i].v2), &(face[i].v3), &(face[i].v4));
}
 
void init (void)   
{   
    glClearColor (1.0, 1.0, 1.0, 0.0) ;       
    glColor3f(1.0, 1.0, 0.0);   
    glEnable(GL_DEPTH_TEST);    // 깊이 활성화  
     
    File_Load();
}   
 
void reshape (int w, int h)   
{   
    glViewport(0, 0, w, h);   
    glMatrixMode (GL_PROJECTION);     
    glLoadIdentity();   
    //glOrtho (-5.0, 5.0, -5.0, 5.0, -5.0, 5.0);   
    gluPerspective(45.0, 1.0, 1.0, 100.0 ); // 멀고 가까움을 표현함
}   
 
void Draw_Box(void)
{
    int i;
     
    for(i=0;i<f_no;i++)
    {
        glBegin(GL_POLYGON);
        glColor3f(color[face[i].v1][0], color[face[i].v1][1], color[face[i].v1][2]);
        glVertex3f(ver[face[i].v1].x, ver[face[i].v1].y, ver[face[i].v1].z);
        glColor3f(color[face[i].v2][0], color[face[i].v2][1], color[face[i].v2][2]);
        glVertex3f(ver[face[i].v2].x, ver[face[i].v2].y, ver[face[i].v2].z);
        glColor3f(color[face[i].v3][0], color[face[i].v3][1], color[face[i].v3][2]);
        glVertex3f(ver[face[i].v3].x, ver[face[i].v3].y, ver[face[i].v3].z);
        glColor3f(color[face[i].v4][0], color[face[i].v4][1], color[face[i].v4][2]);
        glVertex3f(ver[face[i].v4].x, ver[face[i].v4].y, ver[face[i].v4].z);
        glEnd();
    }
}
 
void display (void)   
{   
     
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);   
    glMatrixMode (GL_MODELVIEW);       
    glLoadIdentity();   
    gluLookAt(5.0, 5.0, 5.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0);
     
    glBegin(GL_LINES);  // X, Y, Z 선 표시   
    glColor3f(1.0, 0.0, 0.0); // X축    
    glVertex3f(0.0, 0.0, 0.0);   
    glVertex3f(10.0, 0.0, 0.0);   
     
    glColor3f(0.0, 1.0, 0.0); // Y축    
    glVertex3f(0.0, 0.0, 0.0);   
    glVertex3f(0.0, 10.0, 0.0);   
     
    glColor3f(0.0, 0.0, 1.0); // Z축    
    glVertex3f(0.0, 0.0, 0.0);   
    glVertex3f(0.0, 0.0, 10.0);   
    glEnd();   
     
    Draw_Box();
     
    glFlush ();    
    glutSwapBuffers();   
}   
 
void key(unsigned char key, int x, int y)
{
    switch(key)
    {
    case 27:
        exit(0);
        break;
    }
}
 
void specialKey(int key, int x, int y)
{ 
    switch(key)
    {
    case GLUT_KEY_LEFT:
        cameraX -= 1;
        break;
    case GLUT_KEY_RIGHT:
        cameraX += 1;
        break;
    case GLUT_KEY_UP:
        cameraY += 1;
        break;
    case GLUT_KEY_DOWN:
        cameraY -= 1;
        break;
    }
    //glutPostRedisplay();
}
 
void main (int argc, char** argv)   
{ 
    glutInit (&argc, argv);    
    glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );  
    glutInitWindowPosition (100, 100);    
    glutInitWindowSize (500, 500);   
    glutCreateWindow ("Cube");  
    init(); 
    glutDisplayFunc (display);   
    glutReshapeFunc (reshape);  
    glutKeyboardFunc(key);
    glutSpecialFunc(specialKey);
    glutIdleFunc(display);
    glutMainLoop();   
}


box[1].txt

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