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I have looked at some questions posted here on the matter and still cant work out why my 2d HUD appears but makes my 3d Rendered world disappear. EDIT: It seems that the 2d scene is taking control of the entire screen so every now and then I can see the 3d scene glitching through the 2d scene. So even though I its only ment to be rendering a quad thats 10 x 10 pixels it renders this then blanks out the rest of the screen. glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(40.0,(GLdouble)x/(GLdouble)y,0.5,20.0); glMatrixMode(GL_MODELVIEW); glViewport(0,0,x,y); glClear(GL_COLOR_BUFFER_BIT); glLoadIdentity(); glTranslatef(0.0,-0.5,-6.0); glPushMatrix(); ..Draw some 3d stuff... glPopMatrix(); // Start 2d glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, -1, 1); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glColor3f(0.0f, 255.0f, 1.0f); glBegin(GL_QUADS); glVertex2f(0.0, 0.0); glVertex2f(10.0, 0.0); glVertex2f(10.0, 10.0); glVertex2f(0.0, 10.0); glEnd(); Then I swap buffers Here is the order of my code. Its like it makes the 3d space then makes the 2d space which in turn cancels out the 3d space.

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