Small Code Example

The following code, will launch the named object [K] Nova at the avatar owning the object using the low theta angle and with a velocity that is half of the current region FPS. The calibration of the speed to the region FPS is meant to avoid the projectile going through the target.

artillery_fire_at_toucher.lsl

///////////////////////////////////////////////////////////////////////////
//  Copyright (C) Wizardry and Steamworks 2011 - License: GNU GPLv3      //
//  Please see: http://www.gnu.org/licenses/gpl.html for legal details,  //
//  rights of fair usage, the disclaimer and warranty conditions.        //
///////////////////////////////////////////////////////////////////////////
 
fireNova(key targetKey) {
    float initialVelocity = llGetRegionFPS()/2.0;
    vector target = llList2Vector(llGetObjectDetails(targetKey, [OBJECT_POS]), 0);
    vector origin = llGetPos();
    float distanceDelta=llVecDist(<target.x,target.y,0>,<origin.x,origin.y,0>);
    float valSin = 9.81*distanceDelta/llPow(initialVelocity, 2);
    if(valSin < -1 || valSin > 1) return;
    rotation rotationDelta = llRotBetween(<1,0,0>,llVecNorm(<target.x-origin.x,target.y-origin.y, distanceDelta*llTan((RAD_TO_DEG*llAsin(valSin)/2) * DEG_TO_RAD) + target.z-origin.z>));
    llRezObject("[K] Nova", llGetLocalPos(), llVecNorm(<1,0,0>*rotationDelta)*initialVelocity, rotationDelta, 0);
}
 
default {
    touch_start(integer num) {
        fireNova(llGetOwner());
    }
}