if anyone here has played call of duty 4, you will know what i am talking about.
When a grenade goes off, there is an explosion and an aura of blurred heat around it. does anyone know how to recreate this heat blur

Try alpha sprites, should do the trick, either animated or script maipulated for shimmering and movement.

search for the refraction shader and mix it with a flat plane model which has a radial alpha blending texture, could do the trick

thanx