source: downloads/Samples/Media/materials/scripts/smoke.material @ 5

material Examples/Smoke
{
        technique
        {
                pass
                {
                        lighting off
                        scene_blend alpha_blend
                        depth_write off

                        texture_unit
                        {
                                texture smoke.png
                                tex_address_mode clamp
                        }
                }
        }
}