Hi guys, neebie here newly working in the world of 3d graphics. I’m looking to make the first step in creating a globe. I am looking to first off create a wire frame of the globe With the only lines representing sections of lat and longs…essentially just layered circles, no triangles. I’ll be using this model in a mapped coordinate system later, and wanna be sure I get off on the right track. Any help, comments, or suggestions would be appreciated. Thanks for you help.
-me
Using the following code and setting polygon mode to wire should do what you want…
private void drawMapedSphere ( GL gl )
{
int n =64;
double x = 0;
double y = 0;
double z = 0;
double phi1, phi2, theta;
for( int i = 0; i < n; i++ )
{
phi1 = i * PI / n;
phi2 = (i + 1) * PI / n;
gl.glBegin ( GL_QUAD_STRIP );
for( int j = 0; j <= n; j++ )
{
theta = j * 2 * PI / n;
x = sin ( theta ) * sin ( phi1 );
y = cos ( phi1 );
z = cos ( theta ) * sin ( phi1 );
gl.glNormal3d ( x,y,z );
gl.glTexCoord2d ( 0.5 + (double)j / n, (double)i / n );
gl.glVertex3d ( x,y,z );
x = sin ( theta ) * sin ( phi2 );
y = cos ( phi2 );
z = cos ( theta ) * sin ( phi2 );
gl.glNormal3d ( x,y,z );
gl.glTexCoord2d ( 0.5 + (double)j / n, (i+1.0) / n );
gl.glVertex3d ( x,y,z );
}
gl.glEnd ();
}
}