HamSandWich function:
PHP Code:
Ham_TraceAttack 
Description:
Forward: This function is called when an entity is shot by another player (weapon, not grenade.)
Function: This function simulates a weapon attack on an entity.
You should use this function when you want to simulate an attack by a weapon from a player (like a gunshot!)

Parameters:
(ent, attacker, float:damage, Float:direction[3], trace, bits)
- ent is the entity that has been shot
- attacker is the entity that shoot the victim
- damage - this is the damage done by the shot but it does not have the hitgroup multiplication done (that is done before TakeDamage Call)
- direction - this parameter has a very important roll, it is a normalized vector that shows the direction of the bullets path
- trace - the trace handle that offers lots of useful information
- bits - the damage bits

Forward usage:
PHP Code:
#define SHOT_DISTANCE_POSSIBLE 2048.0

// plugin_init()
Register_Ham(Ham_TraceAttack, "func_breakable", "fw_traceatt_break")

public fw_traceatt_break(ent, attacker, float:damage, Float:direction[3], trace, bits)
{
    new Float:start[3], end[3], fraction, multi
    get_tr2(trace, TR_vecEndPos, end)
    get_tr2(trace, TR_flFraction, fraction)
    
    multi = fraction * SHOT_DISTANCE_POSSIBLE
    
    xs_vec_mul_scalar(direction, multi, start)
    
    // This is how to correctly get the start origin!
    xs_vec_add(start, end, start)
    
} 
Function true usage:
PHP Code:
#define SHOT_DISTANCE_POSSIBLE 2048.0

public Ham_Shoot(attacker, damage, bits, bool:can_penetrate)
{
    new Float:angles[3], Float:start[3], Float:end[3], Float:direction[3], Float:fakeend[3]
    
    // Turn the angles in a true vector
    pev(attacker, pev_angles, angles)
    angle_vector(angles, ANGLEVECTOR_FORWARD, direction)
    
    // We make this as a normal shot!
    xs_vec_mul_scalar(direction, SHOT_DISTANCE_POSSIBLE, fakeend)
    
    // Start origin
    pev(attacker, pev_origin, start)
    pev(attacker, pev_view_ofs, end)
    xs_vec_add(end, start, start)
    
    // Obtain the end shot origin
    xs_vec_add(start, fakeend, end)
    
    // From now this is how these variables will be used
    // origin - start place (will remain constant!)
    // end - end place (will remain constant!)
    // angles - no use
    // fakeend - dynamic start origin
    // direction - will be used in the forwards (will remain constant!)
    
    new ptr = create_tr2()
    
    // Trace to the first entity
    engfunc(EngFunc_TraceLine, start, end, DONT_IGNORE_MONSTERS, attacker, ptr)
    
    new Float:fraction, hit = get_tr2(ptr, TR_pHit)
    get_tr2(ptr, TR_flFraction, fraction)
    
    // Update the fake start origin
    get_tr2(ptr, TR_vecEndPos, fakeend)
    
    // This means that we hited sky!
    if (fraction != 1.0 && engfunc(EngFunc_PointContents, fakeend) == CONTENTS_SKY && hit == -1)
    {
        // Prepare the trace handle
        set_tr2(ptr, TR_pHit, 0)
        
        // Bullet trace!
        ExecuteHamB(Ham_TraceAttack, 0, attacker, damage, direction, ptr, DMG_NEVERGIB | DMG_BULLET)
        
        free_tr2(ptr)
        return -1
    }
    
    if (hit == -1)
    {
        hit = 0
        set_tr2(ptr, TR_pHit, hit)
    }
    
    ExecuteHamB(Ham_TraceAttack, hit, attacker, damage, direction, ptr, DMG_NEVERGIB | DMG_BULLET)
    
    if (!can_penetrate)
    {
        free_tr2(ptr)
        return 1
    }
    
    // Trace to the next entity
    engfunc(EngFunc_TraceLine, fakeend, end, DONT_IGNORE_MONSTERS, hit, ptr)
    
    hit = get_tr2(ptr, TR_pHit)
    get_tr2(ptr, TR_flFraction, fraction)
    
    // Update the fake start origin
    get_tr2(ptr, TR_vecEndPos, fakeend)
    
    if (hit == -1)
    {
        hit = 0
        set_tr2(ptr, TR_pHit, hit)
    }
    
    set_tr2(ptr, TR_flFraction, get_distance_f(start, fakeend) / SHOT_DISTANCE_POSSIBLE)
    
    ExecuteHamB(Ham_TraceAttack, hit, attacker, damage, direction, ptr, DMG_NEVERGIB | DMG_BULLET)
    
        
    free_tr2(ptr)
    return 1
}