fCraft.Particle.PerformInternal C# (CSharp) Method

        protected override int PerformInternal()
        {
            //lock is done already
            if ( Block.Undefined == _prevBlock ) //created out of bounds, dont continue
                return 0;
            //fix for portal gun
            if ( _owner.orangePortal.Count > 0 ) {
                if ( _pos == _owner.orangePortal[0] || _pos == _owner.orangePortal[1] )
                    return 0;
            }
            if ( _owner.bluePortal.Count > 0 ) {
                if ( _pos == _owner.bluePortal[0] || _pos == _owner.bluePortal[1] )
                    return 0;
            }

            //delete at the previous position, restore water unconditionally, lava only when bullet is still there to prevent restoration of explosion lava
            if ( _prevBlock != Block.Water )
                _prevBlock = Block.Air;
            //edit: lazyfix, dont restore lava coz tnt.

            if ( Block.Undefined != _prevBlock ) {
                if ( _owner.CanPlace( _map, _pos, Block.Wood, BlockChangeContext.Manual ) == CanPlaceResult.Allowed ) {
                    UpdateMap( new BlockUpdate( null, _pos, _prevBlock ) );
                }
            }

            List<BlockUpdate> updates = new List<BlockUpdate>();
            for ( int i = 0; i < _behavior.MovesPerProcessingStep && _restDistance > 0; ++i ) {
                _pos = Move();
                _prevBlock = _map.GetBlock( _pos );

                if ( Block.Undefined == _prevBlock ) {
                    _restDistance = 0;
                    break;
                }

                _behavior.ModifyDirection( ref _direction, _prevBlock ); //e.g. if you want it to be dependent on gravity or change direction depending on current block etc

                if ( _behavior.VisitBlock( _world, _pos, _prevBlock, _owner, ref _restDistance, updates, _block ) && _behavior.CanKillPlayer )
                    CheckHitPlayers( updates );
            }

            bool cont = _restDistance > 0;
            if ( cont ) //check if the last update was for the current position and replace it with the particle
            {
                int idx = updates.Count - 1;
                if ( idx >= 0 && updates[idx].X == _pos.X
                    && updates[idx].Y == _pos.Y
                    && updates[idx].Z == _pos.Z ) {
                    if ( _owner.CanPlace( _map, _pos, Block.Wood, BlockChangeContext.Manual ) == CanPlaceResult.Allowed ) {
                        updates[idx] = new BlockUpdate( null, _pos, _block );
                    }
                } else {
                    if ( _owner.CanPlace( _map, _pos, Block.Wood, BlockChangeContext.Manual ) == CanPlaceResult.Allowed ) {
                        updates.Add( new BlockUpdate( null, _pos, _block ) );
                    }
                }
            }

            for ( int i = 0; i < updates.Count; ++i )
                UpdateMap( updates[i] );

            return cont ? _stepDelay : 0;
        }