source: GTP/trunk/App/Demos/Illum/IBRBillboardCloudTrees/OGRE/IBRTreesOGRE/media/particle/Example-Water.particle @ 1493

Examples/Water/Rain
{
    material        Examples/Droplet
    particle_width  100
    particle_height 300
    cull_each       true
    quota           100
    // Make common direction straight down (faster than self oriented)
    billboard_type  oriented_common
    common_direction 0 -1 0
    
    // Area emitter
    emitter Box
    {
        angle           0
        emission_rate   20
        time_to_live    5
        direction       0 -1 0
        velocity        1000
        colour_range_start  0.3 1 0.3
        colour_range_end    0.7 1 0.7
        width           3000
        height          3000
        depth           0
    }

    // Gravity
    affector LinearForce
    {
        force_vector      0 -1000 0
        force_application add
    }

}