glClearColor(0.1, 0.5,0.8, 1.0);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);
glEnable(GL_CULL_FACE);
glBegin(GL_TRIANGLES);
glVertex3f(-100.0f, -100.0f, -1.5f);
glVertex3f(100.0f, -100.0f, -1.5f);
glVertex3f(0.0f, 100.0f, -1.5f);
glVertex3f(0.3f, -0.3f, -2.5f);
glVertex3f(-0.3f, -0.3f, -2.5f);
glVertex3f(0.0f, 0.3f, -2.5f);
glBegin(GL_POINT);
glVertex3f(0.0f, -0.0f, -2.5f);
glBegin(GL_LINE);
glVertex3f(0.0f, -0.0f, -2.5f);
glVertex3f(0.5f, -0.5f, -2.5f);
glEnd();
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