Animated sc-fi tunnel effect.
Based on original effect 'Relief Tunnel' by iq (2009).
3 params- offsetx, offsety, speed.
Note- This effect is similar to the 'webglSphere.fx' and may not render correctly on some
systems..I think its down to how the Sprite object renders using GLWRAP.
If I solve the problem I will post details.
fxfiles and demo-