opengl显示stl文件的虚拟物体

Question

求高手帮助 opengl显示stl文件的虚拟物体时，生成的虚拟物体转动然后显示就出现问题 并且转动几次就中断 附上代码和程序 希望大神们帮忙一下。

Answer 1

int num;
int p=0;
float verts;
float *vnorms;
double angle = 0.0;

void getstlmodel()
{
int max=0;
bool isbegin=false;
long size=0;
int nlines=0;
int count1=0;
int count2=0;
FILE file=fopen("MR.stl","r");
fseek(file,0L,SEEK_END);
size=ftell(file);
fclose(file);
file=fopen("MR.stl","r");
for (int i=0;i<size;i++)
{
if(getc(file)=='\n')
{
nlines++;
}
}
num=nlines/7;
rewind(file);
while (getc(file) != '\n');
verts=new float[9*num];
vnorms=new float[9*num];
for (int i=0;i<num;i++)
{
char x[9999]="";
char y[9999]="";
char z[9999]="";
if(3!=fscanf(file,"%*s %*s %80s %80s %80s\n",x,y,z))
{
break;
}
vnorms[count1]=vnorms[count1+3]=vnorms[count1+6]=atof(x);
count1++;
vnorms[count1]=vnorms[count1+3]=vnorms[count1+6]=atof(y);
count1++;
vnorms[count1]=vnorms[count1+3]=vnorms[count1+6]=atof(z);
count1+=7;
fscanf(file,"%*s %*s");
if (3!=fscanf(file,"%*s %80s %80s %80s\n",x,y,z))
{
break;
}
if (isbegin==false)
{
isbegin=true;
max=atof(z);
}
verts[count2]=atof(x);
count2++;
verts[count2]=atof(y);
count2++;
verts[count2]=atof(z);
count2++;
if (3!=fscanf(file,"%*s %80s %80s %80s\n",x,y,z))
{
break;
}
verts[count2]=atof(x);
count2++;
verts[count2]=atof(y);
count2++;
verts[count2]=atof(z);
count2++;
if (3!=fscanf(file,"%*s %80s %80s %80s\n",x,y,z))
{
break;
}
verts[count2]=atof(x);
count2++;
verts[count2]=atof(y);
count2++;
verts[count2]=atof(z);
count2++;
fscanf(file,"%*s");
fscanf(file,"%*s");
}
}
void display(void)
{
/*getstlmodel();*/
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glEnable (GL_DEPTH_TEST);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glLoadIdentity();
glPushMatrix();

glRotatef(angle,0.0,1.0,0.0);
for(int i=0;i<=9*num;i=i+9,p=p+9)
{
glBegin(GL_TRIANGLES);
glColor4f(1,1,1,1);
glNormal3d(vnorms[p],vnorms[p+1],vnorms[p+2]);
glVertex3d(verts[i]/10,verts[i+1]/10,verts[i+2]/10);
glVertex3d(verts[i+3]/10,verts[i+4]/10,verts[i+5]/10);
glVertex3d(verts[i+6]/10,verts[i+7]/10,verts[i+8]/10);
glEnd();

}
glPopMatrix();
glFlush;
glutSwapBuffers();

}

void init(void)

{

GLfloat light_position [ ] = { 1.0, 1.0, 1.0, 0.0 };   
GLfloat mat_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };  
glClearColor ( 0.0, 0.0, 0.0, 0.0 ); //设置背景色为黑色  
glShadeModel ( GL_SMOOTH );     
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);  
glLightfv ( GL_LIGHT0, GL_POSITION, light_position);   
glEnable (GL_LIGHTING);   
glEnable (GL_LIGHT0);   

}

void reshape (int w, int h)

{

glViewport (0, 0, (GLsizei) w, (GLsizei) h);

glMatrixMode (GL_PROJECTION);

glLoadIdentity ( );

if (w <= h)

glOrtho (-1.5, 1.5, -1.5 * ( GLfloat ) h / ( GLfloat ) w,

1.5* ( GLfloat ) h / ( GLfloat ) w, -10.0, 10.0 ); //创建平行视景体

else

glOrtho (-1.5 * ( GLfloat ) w / ( GLfloat ) h,1.5 * ( GLfloat )

w/( GLfloat ) h, -1.5, 1.5, -10.0, 10.0);

glMatrixMode ( GL_MODELVIEW );

glLoadIdentity ( ) ;

}
static void key(unsigned char key, int x, int y)

{

switch (key)

{

case 27 :

case 'q':

exit(0);

break;

case '+':  
    angle++;  
    break;  

case '-':  
    angle--;  
    break;  
}  

glutPostRedisplay();  

}

/*void SpecialKeys(int key, int x, int y)
{
if(key == GLUT_KEY_UP)
viewFrame.RotateWorld(m3dDegToRad(-1.0), 1.0f, 0.0f, 0.0f);

if(key == GLUT_KEY_DOWN)
    viewFrame.RotateWorld(m3dDegToRad(1.0), 1.0f, 0.0f, 0.0f);

if(key == GLUT_KEY_LEFT)
    viewFrame.RotateWorld(m3dDegToRad(-1.0), 0.0f, 1.0f, 0.0f);

if(key == GLUT_KEY_RIGHT)
    viewFrame.RotateWorld(m3dDegToRad(1.0), 0.0f, 1.0f, 0.0f);

// Refresh the Window
glutPostRedisplay();

}*/

void show()
{glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glLoadIdentity();
glEnable (GL_DEPTH_TEST);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glLoadIdentity();
glPushMatrix();

glRotatef(angle,0.0,1.0,0.0);
for(int i=0;i<=9*num;i=i+9,p=p+9)
{
glBegin(GL_TRIANGLES);
glColor4f(1,1,1,1);
glNormal3d(vnorms[p],vnorms[p+1],vnorms[p+2]);
glVertex3d(verts[i]/10,verts[i+1]/10,verts[i+2]/10);
glVertex3d(verts[i+3]/10,verts[i+4]/10,verts[i+5]/10);
glVertex3d(verts[i+6]/10,verts[i+7]/10,verts[i+8]/10);
glEnd();

}
glPopMatrix();
glFlush;
glutSwapBuffers();
}

int main(int argc, char *argv[])
{
getstlmodel();
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutInitWindowPosition(200, 300);
glutInitWindowSize(640, 480);
glutCreateWindow("读取");
init();
glutReshapeFunc (&reshape );

// glutSpecialFunc(SpecialKeys);
glutKeyboardFunc(key);
glutDisplayFunc(&show);
glutMainLoop();
return 0;
delete[]verts;
delete[]vnorms;
}