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how to place this cube

December 14, 2011 - 4:56pm #1

i have a opengl code for forming a cube. Here is that code

#include

GLfloat light_diffuse[] = {1.0, 0.0, 0.0, 1.0}; /* Red diffuse light. */
GLfloat light_position[] = {1.0, 1.0, 1.0, 0.0}; /* Infinite light location. */
GLfloat n[6][3] = { /* Normals for the 6 faces of a cube. */
{-1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}, {1.0, 0.0, 0.0},
{0.0, -1.0, 0.0}, {0.0, 0.0, 1.0}, {0.0, 0.0, -1.0} };
GLint faces[6][4] = { /* Vertex indices for the 6 faces of a cube. */
{0, 1, 2, 3}, {3, 2, 6, 7}, {7, 6, 5, 4},
{4, 5, 1, 0}, {5, 6, 2, 1}, {7, 4, 0, 3} };
GLfloat v[8][3]; /* Will be filled in with X,Y,Z vertexes. */

void
drawBox(void)
{
int i;

for (i = 0; i glBegin(GL_QUADS);
glNormal3fv(&n[i][0]);
glVertex3fv(&v[faces[i][0]][0]);
glVertex3fv(&v[faces[i][1]][0]);
glVertex3fv(&v[faces[i][2]][0]);
glVertex3fv(&v[faces[i][3]][0]);
glEnd();
}
}

void
display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
drawBox();
glutSwapBuffers();
}

void
init(void)
{
/* Setup cube vertex data. */
v[0][0] = v[1][0] = v[2][0] = v[3][0] = -1;
v[4][0] = v[5][0] = v[6][0] = v[7][0] = 1;
v[0][1] = v[1][1] = v[4][1] = v[5][1] = -1;
v[2][1] = v[3][1] = v[6][1] = v[7][1] = 1;
v[0][2] = v[3][2] = v[4][2] = v[7][2] = 1;
v[1][2] = v[2][2] = v[5][2] = v[6][2] = -1;

/* Enable a single OpenGL light. */
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHTING);

/* Use depth buffering for hidden surface elimination. */
glEnable(GL_DEPTH_TEST);

/* Setup the view of the cube. */
glMatrixMode(GL_PROJECTION);
gluPerspective( /* field of view in degree */ 40.0,
/* aspect ratio */ 1.0,
/* Z near */ 1.0, /* Z far */ 10.0);
glMatrixMode(GL_MODELVIEW);
gluLookAt(0.0, 0.0, 5.0, /* eye is at (0,0,5) */
0.0, 0.0, 0.0, /* center is at (0,0,0) */
0.0, 1.0, 0.); /* up is in positive Y direction */

/* Adjust cube position to be asthetic angle. */
glTranslatef(0.0, 0.0, -1.0);
glRotatef(60, 1.0, 0.0, 0.0);
glRotatef(-20, 0.0, 0.0, 1.0);
}

int
main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutCreateWindow("red 3D lighted cube");
glutDisplayFunc(display);
init();
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}

in order to place this cude over the imagetargets tracker (instead of teapot) what all changes should i make? if possible pls specify the name of files that must be changed and the line number also...

Re: how to place this cube

December 15, 2011 - 1:35am #2

See my reply to your email.
You should really do a search on the forum though.
There's plenty about this out there.

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