Curved cylinder in a 3D space OpenGL (C)

Question

there's a func i wrote below that generate a cylinder starting from origin facing y pos with the height of one. How can i make it curve (toward x let's say, it doesn't really matter)?

void DrawCylinder(int sides, int radius)    
{
    double alpha, theta = 2 * PI / sides;
    for (alpha = 0; alpha <= 2 * PI; alpha += theta)
    {
        glColor3d(0.3 + 0.7*fabs(sin(alpha)), 0.3 + 0.7*fabs(sin(alpha)), 0.3 + 0.7*fabs(sin(alpha)));
        glBegin(GL_POLYGON);
        glVertex3d(radius*cos(alpha), 0, radius*sin(alpha)); // point 1
        glVertex3d(radius*cos(alpha), 1, radius*sin(alpha)); // point 2
        glVertex3d(radius*cos(alpha + theta), 1, radius*sin(alpha + theta)); // point 3
        glVertex3d(radius*cos(alpha + theta), 0, radius*sin(alpha + theta)); // point 4     
        glEnd();
    }
}

here's the attempt to treat it as a torus

void DrawCylinder(int sides, double cylinder_radius, int curve, double torus_radius)    
{
    double alpha, theta = 2 * PI / sides;
    double gamma, phi = 2 * PI / curve;

    for (gamma = 0; gamma <= 2*PI; gamma += phi)
    {
        for (alpha = 0; alpha <= 2 * PI; alpha += theta)
        {
            glColor3d(0.3 + 0.7*fabs(sin(alpha)), 0.3 + 0.7*fabs(sin(alpha)), 0.3 + 0.7*fabs(sin(alpha)));
            glBegin(GL_POLYGON);
            glVertex3d((torus_radius + cylinder_radius*cos(alpha))*cos(gamma), cylinder_radius*sin(alpha), (torus_radius + cylinder_radius*cos(alpha))*sin(gamma)); // point 1
            glVertex3d((torus_radius + cylinder_radius*cos(alpha))*cos(gamma + phi), cylinder_radius*sin(alpha + theta), (torus_radius + cylinder_radius*cos(alpha))*sin(gamma + phi)); // point 2
            glVertex3d((torus_radius + cylinder_radius*cos(alpha + theta))*cos(gamma + phi), cylinder_radius*sin(alpha + theta), (torus_radius + cylinder_radius*cos(alpha + theta))*sin(gamma + phi)); // point 3
            glVertex3d((torus_radius + cylinder_radius*cos(alpha + theta))*cos(gamma), cylinder_radius*sin(alpha), (torus_radius + cylinder_radius*cos(alpha))*sin(gamma)); // point 4      
            glEnd();
        }
    }   
}

I should mention, i built it when 4 vertexs drawn at the same time for a reason. I want to dress each polygon with a texture later on thx

"Curve" mean that the cylinder itself (the whole object) will start to do a "wave like" shape (sin wave) towards one of the axes — Adler, Jun 23 '20 at 12:08
Define it as a torus is a good idea, i tried it but somehow it didn't work @WeatherVane — Adler, Jun 23 '20 at 12:25
There is a question with solution for the same problem : https://stackoverflow.com/questions/52930454/opengl-glut-c-want-to-render-curved-cylinder?rq=1 — Mickaël C. Guimarães, Jun 23 '20 at 12:51

Curved cylinder in a 3D space OpenGL (C)

0 Answers0