glMatrixMode GL_PROJECTION
glLoadIdentity
glOrtho 0 1 0 1 -1 1
glMatrixMode GL_MODELVIEW
glLoadIdentity
glBegin GL_TRIANGLES
glColor 1 0 0
glVertex3 0.0 0.15 2.5
glColor 0 1 0
glVertex3 0.75 0.15 -0.5
glColor 0 0 1
glVertex3 0.75 0.85 -3.5
glEnd
