SCR_AIGetSplinePoint.c

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class SCR_AIGetSplinePoint: AITaskScripted
{
    static const string PORT_ENTITY = "EntityWithSplineIn";
    static const string PORT_POSITION = "PositionOut";
    
    protected static ref TStringArray s_aVarsIn = {
        PORT_ENTITY
    };
    override TStringArray GetVariablesIn()
    {
        return s_aVarsIn;
    }
    
    protected static ref TStringArray s_aVarsOut = {
        PORT_POSITION
    };
    override TStringArray GetVariablesOut()
    {
        return s_aVarsOut;
    }
 
    private int m_iLastIndex;
    private ref array <vector> m_aOffsetPath;
    private vector m_vOrigin;
    private bool m_bShouldFail;
    
    
    protected override void OnInit(AIAgent owner)
    {
        IEntity ent;        
        if(!GetVariableIn(PORT_ENTITY,ent))
            ent = owner.GetControlledEntity();
        
        m_aOffsetPath = new array <vector>;
            
        if (ent.GetChildren())
        {
            IEntity entPoly = ent.GetChildren();
            PolylineShapeEntity polyline = PolylineShapeEntity.Cast(entPoly);
                        
            while (!polyline && entPoly)
            {
                entPoly = entPoly.GetSibling();
                polyline = PolylineShapeEntity.Cast(entPoly);           
            };
            if (!polyline)
            {
                m_bShouldFail = true;
                return;
            }   
 
            m_vOrigin = polyline.GetOrigin();
            
            polyline.GetPointsPositions(m_aOffsetPath);         
        }   
    }
    
    protected override ENodeResult EOnTaskSimulate(AIAgent owner, float dt)
    {
        if (m_bShouldFail)
            return ENodeResult.FAIL;
        
        m_iLastIndex = (m_iLastIndex + 1) % m_aOffsetPath.Count();
        vector positionOut = m_aOffsetPath[m_iLastIndex] + m_vOrigin; 
                        
        SetVariableOut(PORT_POSITION,positionOut);                                      
        
        return ENodeResult.SUCCESS; 
    }
    
    protected static override bool VisibleInPalette()
    {
        return true;
    }   
    
    protected static override string GetOnHoverDescription()
    {
        return "BT node for returning position on spline that is hierarchical child of provided entity. Each tick next point on spline is taken.";
    }   
    
};