OpenGL & C++ : glBegin/glEnd

Question

          glBegin(GL_TRIANGLE_STRIP);
        for(i; i <= degree; i++)
        {
            float 
            sunX=-200/2*cos(i*M_PI/180),
            sunZ=200/2*sin(i*M_PI/180);

            glVertex3f(0, 0, 0);
            glVertex3f(sunX, 0, sunZ);
        }
        glEnd();

This code is work. But...

for(i; i <= degree; i++)
        {
            float 
            sunX=-200/2*cos(i*M_PI/180),
            sunZ=200/2*sin(i*M_PI/180);
                            glBegin(GL_TRIANGLE_STRIP);
            glVertex3f(0, 0, 0);
            glVertex3f(sunX, 0, sunZ);
                            glEnd();
        }

But this doesn't work. Wtf? Where is logic? I need to insert another code into for cycle for text out:

glPushAttrib(GL_LIST_BIT);
glListBase(1000);
glCallLists(strlen(text), GL_UNSIGNED_BYTE, text);
glPopAttrib();

but i can't to insert it, because beetwen glBegin(GL_TRIANGLE_STRIP) and glEnd() it does not work. And i can't write glBegin(GL_TRIANGLE_STRIP), glEnd() inside for cycle, because it does not work there.

Don't use glBegin/glEnd and the rest of the old pipeline... it is no longer good practice... — dtech

Code-Apprentice Code-Apprentice · Accepted Answer · 2013-06-22T20:23:41

Every time you call glBegin(GL_TRIANGLE_STRIP); you are starting a brand new triangle strip. It will not be connected to the other vertices from previous iterations of the for loop.

OpenGL & C++ : glBegin/glEnd

2 Answers