Render Sphere in OpenGL ES for iOS, converted from http://www.codesampler.com/oglsrc/oglsrc_9.htm

gistfile1.c++

void renderSphere(float cx, float cy, float cz, float r, int p)
{
    float theta1 = 0.0, theta2 = 0.0, theta3 = 0.0;
    float ex = 0.0f, ey = 0.0f, ez = 0.0f;
    float px = 0.0f, py = 0.0f, pz = 0.0f;
    GLfloat vertices[p*6+6], normals[p*6+6], texCoords[p*4+4];
    
    if( r < 0 )
        r = -r;
    
    if( p < 0 )
        p = -p;
    
    for(int i = 0; i < p/2; ++i)
    {
        theta1 = i * (M_PI*2) / p - M_PI_2;
        theta2 = (i + 1) * (M_PI*2) / p - M_PI_2;
        
        for(int j = 0; j <= p; ++j)
        {
            theta3 = j * (M_PI*2) / p;
            
            ex = cosf(theta2) * cosf(theta3);
            ey = sinf(theta2);
            ez = cosf(theta2) * sinf(theta3);
            px = cx + r * ex;
            py = cy + r * ey;
            pz = cz + r * ez;
            
            vertices[(6*j)+(0%6)] = px;
            vertices[(6*j)+(1%6)] = py;
            vertices[(6*j)+(2%6)] = pz;
            
            normals[(6*j)+(0%6)] = ex;
            normals[(6*j)+(1%6)] = ey;
            normals[(6*j)+(2%6)] = ez;
            
            texCoords[(4*j)+(0%4)] = -(j/(float)p);
            texCoords[(4*j)+(1%4)] = 2*(i+1)/(float)p;
            
            
            ex = cosf(theta1) * cosf(theta3);
            ey = sinf(theta1);
            ez = cosf(theta1) * sinf(theta3);
            px = cx + r * ex;
            py = cy + r * ey;
            pz = cz + r * ez;
            
            vertices[(6*j)+(3%6)] = px;
            vertices[(6*j)+(4%6)] = py;
            vertices[(6*j)+(5%6)] = pz;
            
            normals[(6*j)+(3%6)] = ex;
            normals[(6*j)+(4%6)] = ey;
            normals[(6*j)+(5%6)] = ez;
            
            texCoords[(4*j)+(2%4)] = -(j/(float)p);
            texCoords[(4*j)+(3%4)] = 2*i/(float)p;
        }
        glVertexPointer(3, GL_FLOAT, 0, vertices);
        glNormalPointer(GL_FLOAT, 0, normals);
        glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
        glDrawArrays(GL_TRIANGLE_STRIP, 0, (p+1)*2);
    }
}

thanks man! :)

Hi, could you explain the code a little bit or is there any reference? The link is invalid. Thanks