OK first make the area where you want the mortar to land. For example, select the terrain mesh and press Y to bring up the terrain editor. Use the paint height to make the impact hole. Next, right click on the 2d view and go to Script>Model. Leave it as a red box and give it a targetname of mortar. Save the map and compile.



Now for the .gsc file. Create a new txt file, rename it to .gsc and put this into it:

    // Specify two different explosion effects to randomly play

    level._effect["mortar_explosion"][0] = loadfx ("fx/impacts/newimps/dirthit_mortar2day.efx");

    level._effect["mortar_explosion"][1] = loadfx ("fx/impacts/newimps/minefield.efx");

    // send down the mortars

    level thread mortars();

}    

mortars()

{

    // Get an array of all the mortars in the level

    mortar = getentarray ("mortar","targetname");

    // Loop over and over while the level is loaded

    while (1)

    {

    // Wait 5-10 seconds randomly before doing a mortar explosion

    wait (5 + randomfloat(5));

    // Make sure there are no players close enough to this mortar to kill them

    GoodPosition = false;

    while (!GoodPosition)

    {

    // Pick a random mortar location

    rand = randomint(mortar.size);

    // Check if any players are within 200 of the randomly picked mortar

    GoodPosition = true;

    players = getentarray("player", "classname");

    for(i = 0; i < players.size; i++)

    {

    if (distance(mortar[rand].origin,players[i].origin) < 200)

    {

    GoodPosition = false;

    break;

    }

    }

    }

    // Play the incomming mortar sound effect

    mortar[rand] playsound("mortar_incoming");

    // Wait 2 seconds while the imcomming sound plays

    wait 2;

    // Do the explosion effect

    origin = mortar[rand] getorigin();

    playfx (level._effect["mortar_explosion"][randomint(2)], origin);

    // Play the explosion sound

    mortar[rand] playsound("mortar_explosion");

    // Make the explosion cause damage

    radiusDamage(mortar[rand].origin, 300, 2000, 50);

mapsmpmortar::main();