Torus

OpenGL OpenGL: Basic Coding
1

is there a way you can create a torus using opengl gl and glu only…i do not want to use glut and i am trying not to…but i need to create a torus and i am not sure how to go about it…help…

2

There is no function in gl or glu to do that per se. But there is nothing stopping you from sweeping a partitioned circle about an axis (that lies in the plane of the circle) and creating the required mesh and drawing triangle strips.

[This message has been edited by DFrey (edited 02-16-2001).]

3

is there code somewhere that is good to produce a good torus?

4

#include <GL/gl.h>
#include <GL/glu.h>
#include <stdio.h>
#include <math.h>
#include <GL/glut.h>
#include <stdlib.h>
.
.
.

static void torus(int numc, int numt){
int i, j, k;
double s, t, x, y, z, twopi;

twopi = 2 * (double)M_PI;
for (i = 0; i < numc; i++) {
glBegin(GL_QUAD_STRIP);
for (j = 0; j <= numt; j++) {
for (k = 1; k >= 0; k–) {
s = (i + k) % numc + 0.5;
t = j % numt;

        x = (1+.1*cos(s*twopi/numc))*cos(t*twopi/numt);
        y = (1+.1*cos(s*twopi/numc))*sin(t*twopi/numt);
        z = .1 * sin(s * twopi / numc);
        glVertex3f(x, y, z);
     }
  }
  glEnd();

}
}

Found this in the Red Book which is located at http://ask.ii.uib.no/ebt-bin/nph-dweb/dynaweb/SGI_Developer/OpenGL_PG/