In article <48***********************@news.sunsite.dk>,

af*@asd.com
says...

[ ... ]

Ok but how would you generate the data for a wireframe model of a sphere

from C++?

It depends on the exact sort of wire-frame you want. Obvious choices are

latitude-like lines, longitude-like lines, or both. Here's a bit of code

to generate some points that approximate a wire-frame (i.e. the points

are close together, but not really connected).

double d2r(double degrees) {

const double conversion = 3.1416f/180.0f;

return degrees * conversion;

}

void Sphere(double radius) {

for (int latitude=-90; latitude<90; latitude++) {

double current_radius = cos(d2r(latitude)) * radius;

double z = sin(d2r(latitude)) * radius;

// Every 10 degrees of latitude, draw a longitude line.

// Otherwise, draw a point every 10 degrees of longitude.

int increment = latitude % 10 ? 10 : 1;

for (int longitude=0; longitude<360; longitude+=increment) {

double x = cos(d2r(longitude))*current_radius;

double y = sin(d2r(longitude))*current_radius;

// (x,y,z) is a point in the wireframe

}

}

}

--

Later,

Jerry.

The universe is a figment of its own imagination.