I often draw vertex outside the window, ie, my window is 800x480 and my settings are as follow:
glViewport(0, 0, 800, 480);
gluPerspective(90.0f, 800/480, 0.1f, 100.0f);
glTranslatef(1.0f, 0.0f, -6.0f);
i dont know where is the left/right/top/bottom most point that
i can draw.
ie, is the point(-5.0f, 0.0f, 0.0f) inside my window? what about the point(-7.0f, 0.0f, 0.0f)?