actiontargets.c

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class VicinityObjects
{
    private ref map<Object, Object> m_VicinityObjects;
    
    void VicinityObjects()
    {
        m_VicinityObjects = new map<Object, Object>;
    }
 
    void StoreVicinityObject(Object object, Object parent = null)
    {
        ItemBase ib = ItemBase.Cast(object);
        if (ib && (ib.IsBeingPlaced() || ib.IsHologram()))
            return;
 
        /*if(object && object.IsPlainObject())
        {
            Print("ERROR: VicinityObjects | StoreVicinityObject | IsPlainObject check fail");
            return;
        }*/
        
        if ( !m_VicinityObjects.Contains(object) )
        {
            m_VicinityObjects.Set(object, parent);
        }
    }
 
    void TransformToVicinityObjects(array<Object> objects)
    {
        for (int i = 0; i < objects.Count(); i++)
        {
            if (objects[i].GetType() != "" && objects[i].CanBeActionTarget())
            {
                StoreVicinityObject(objects[i]);
                //Print("storing, 2nd pass: " + objects[i]);
            }
        }
    }
    
    void ClearVicinityObjects()
    {
        m_VicinityObjects.Clear();
    }
 
    array< Object > GetVicinityObjects()
    {
        ref array<Object> vicinityObjects = new array<Object>;
        for (int i = 0; i < m_VicinityObjects.Count(); i++)
        {
            ItemBase ib = ItemBase.Cast(GetObject(i));
            if (ib && !ib.IsTakeable())
                continue;
 
            vicinityObjects.Insert(GetObject(i));
        }
        
        return vicinityObjects;
    }
    
    array< Object > GetRawVicinityObjects()
    {
        ref array<Object> vicinityObjects = new array<Object>;
        for (int i = 0; i < m_VicinityObjects.Count(); i++)
        {
            vicinityObjects.Insert(GetObject(i));
        }
        
        return vicinityObjects;
    }
 
    Object GetObject(int i)
    {
        return m_VicinityObjects.GetKey(i);
    }
 
    Object GetParent(int i)
    {
        return m_VicinityObjects.GetElement(i);
    }
    
    int Count()
    {
        return m_VicinityObjects.Count();
    }
    
    void Remove(Object object)
    {
        m_VicinityObjects.Remove(object);
    }
    
    void Remove(array<Object> objects)
    {
        for (int i = 0; i < objects.Count(); i++)
        {
            m_VicinityObjects.Remove(objects[i]);
        }
    }
}
 
class ActionTarget
{
    private Object m_Object;        // object itself
    private Object m_Parent;        // null or parent of m_Object
    private int m_ComponentIndex;       // p3d Component ID or -1
    private vector m_CursorHitPos;
    private float m_Utility;
    private string m_SurfaceName;
    private int m_SurfaceLiquidType = LIQUID_NONE;
    
    void ActionTarget(Object object, Object parent, int componentIndex, vector cursorHitPos, float utility, string surfaceName = "")
    {
        m_Object = object;
        m_Parent = parent;
        m_ComponentIndex = componentIndex;
        m_CursorHitPos = cursorHitPos;
        m_Utility = utility;
                
        m_SurfaceName = surfaceName;
        if (m_SurfaceName != "")
        {
            SurfaceInfo surfaceInfo = SurfaceInfo.GetByFile(surfaceName);
            if (surfaceInfo && surfaceInfo.GetLiquidType() != LIQUID_NONE)
                m_SurfaceLiquidType = surfaceInfo.GetLiquidType();
        }
    }
 
    Object GetObject()
    {
        return m_Object;
    }
 
    Object GetParent()
    { 
        return m_Parent; 
    }
 
    bool IsProxy()
    {
        if (m_Parent)
            return true;
        return false;
    }
    
    int GetComponentIndex() 
    { 
        return m_ComponentIndex;
    }
    
    float GetUtility()
    {
         return m_Utility;
    }
    
    vector GetCursorHitPos()
    {
         return m_CursorHitPos; 
    }
    
    void SetCursorHitPos(vector cursor_position)
    {
        m_CursorHitPos = cursor_position;
    }
    
    string GetSurfaceName()
    {
        return m_SurfaceName;
    }
        
    int GetSurfaceLiquidType()
    {
        return m_SurfaceLiquidType;
    }
    
    void DbgPrintTargetDump()
    {
        Print(DumpToString());
    }
    
    string DumpToString()
    {
        string res = "ActionTarget dump = {";
        res = res + "m_Object: " + Object.GetDebugName(m_Object);
        res = res + "; m_Parent: " + Object.GetDebugName(m_Parent);
        res = res + "; m_ComponentIndex: " + m_ComponentIndex.ToString();
        res = res + "; m_CursorHitPos: " + m_CursorHitPos.ToString();
        res = res + "; m_Utility: " + m_Utility.ToString();
        res = res + "}";
        return res;
    }
};
 
class ActionTargets
{
    void ActionTargets(PlayerBase player)
    {
        m_Player = player;
        m_VicinityObjects = new VicinityObjects;
        m_Targets = new array<ref ActionTarget>;
        
        m_Debug = false;
    }
    
    static array<Object> GetVicinityObjects()
    {
        return m_VicinityObjects.GetVicinityObjects();
    }
    
    void Clear()
    {
        m_Targets.Clear();
    }
    
    void Update()
    {   
        int i;
        
        m_VicinityObjects.ClearVicinityObjects();
        Clear();
 
        Object cursorTarget = null;
        EntityAI cursorTargetEntity = null;
        array<Object> vicinityObjects = new array<Object>;
        
        int hitComponentIndex;
        vector playerPos = m_Player.GetPosition();
        vector headingDirection = MiscGameplayFunctions.GetHeadingVector(m_Player);
 
        m_RayStart = GetGame().GetCurrentCameraPosition();
        m_RayEnd = m_RayStart + GetGame().GetCurrentCameraDirection() * c_RayDistance;
 
        RaycastRVParams rayInput = new RaycastRVParams(m_RayStart, m_RayEnd, m_Player);
        rayInput.flags = CollisionFlags.ALLOBJECTS;
        //rayInput.sorted = true;
        array<ref RaycastRVResult> results = new array<ref RaycastRVResult>;
 
        if ( DayZPhysics.RaycastRVProxy(rayInput, results) )
        {
            if ( results.Count() > 0 )
            {
                array<float> distance_helper = new array<float>;
                array<float> distance_helper_unsorted = new array<float>;
                float distance;
                
                for (i = 0; i < results.Count(); i++)
                {
                    distance = vector.DistanceSq(results[i].pos, m_RayStart);
                    distance_helper.Insert(distance);
                    //Print("#" + i + " " + results.Get(i).obj);
                }
                //Print("--------------");
                distance_helper_unsorted.Copy(distance_helper);
                distance_helper.Sort();
                
                RaycastRVResult res;
                
                for (i = 0; i < results.Count(); i++)
                {
                    res = results.Get(distance_helper_unsorted.Find(distance_helper[i])); //closest object
                    
                    cursorTarget = res.obj;
                    Class.CastTo(cursorTargetEntity,cursorTarget);
                    if (cursorTarget && !cursorTarget.CanBeActionTarget())
                        continue;
                    if (res.hierLevel > 0)
                    {
                        if (!res.parent.IsMan())
                        {
                            m_VicinityObjects.StoreVicinityObject(res.obj, res.parent);
                            //Print("storing, 1st pass (hier > 0): " + res.obj);
                        }
                        else
                            continue;
                    }
                    else
                    {
                        m_VicinityObjects.StoreVicinityObject(res.obj, null);
                        //Print("storing, 1st pass: " + res.obj);
                    }
                    
                    m_HitPos = res.pos;
                    hitComponentIndex = res.component;
                    
                    if (res.surface && res.surface.GetSurfaceType() != "")
                    {
                        m_SurfaceInfo = res.surface;
                    }
                    else
                    {
                        SurfaceDetectionParameters surfaceParams = new SurfaceDetectionParameters();
                        surfaceParams.type = SurfaceDetectionType.Roadway;
                        surfaceParams.position = m_HitPos;
                        surfaceParams.includeWater = true;
                        surfaceParams.syncMode = UseObjectsMode.NoWait;
                        surfaceParams.rsd = RoadSurfaceDetection.ABOVE;
                        
                        SurfaceDetectionResult surfaceResult = new SurfaceDetectionResult();
                        if (g_Game.GetSurface(surfaceParams, surfaceResult))
                        {
                            if (surfaceResult && surfaceResult.surface)
                            {
                                m_SurfaceInfo = surfaceResult.surface;
                            }
                        }
                    }
                    break;
                }
            }
            //else
                //Print("NO RESULTS FOUND!");
        }
        else
        {
            //Print("CAST UNSUCCESFUL");
            cursorTarget = null;
            m_HitPos = vector.Zero;
            m_SurfaceInfo = null;
            hitComponentIndex = -1;
        }
        
        //Print(cursorTarget);
        
        DayZPlayerCamera camera = m_Player.GetCurrentCamera();
        if (camera && camera.GetCurrentPitch() <= -45) // Spatial search is a contributor to very heavy searching, limit it to when we are at least looking down
            DayZPlayerUtils.GetEntitiesInCone(playerPos, headingDirection, c_ConeAngle, c_MaxTargetDistance, c_ConeHeightMin, c_ConeHeightMax, vicinityObjects);
        
        vicinityObjects.RemoveItem(m_Player);
 
        //Print("m_VicinityObjects before" + m_VicinityObjects.Count());
        m_VicinityObjects.TransformToVicinityObjects(vicinityObjects);
        //Print("m_VicinityObjects after" + m_VicinityObjects.Count());
        
        FilterObstructedObjectsEx(cursorTarget, vicinityObjects);
        
        for (i = 0; i < m_VicinityObjects.Count(); i++)
        {
            Object object = m_VicinityObjects.GetObject(i);
            Object parent = m_VicinityObjects.GetParent(i);
 
            float utility = ComputeUtility(object, m_RayStart, m_RayEnd, cursorTarget, m_HitPos, m_SurfaceInfo);
            if (utility > 0)
            {
                int targetComponent = -1;
                targetComponent = hitComponentIndex;
 
                string surfaceName;
                if (m_SurfaceInfo && m_SurfaceInfo.GetEntryName() != "")
                    surfaceName = m_SurfaceInfo.GetEntryName();
 
                ActionTarget at = new ActionTarget(object, parent, targetComponent, m_HitPos, utility, surfaceName);
                StoreTarget(at);
            }
            /*else
                Print("utility < 0; object: " + object + " | parent: " + parent);*/
        }
 
        if (m_HitPos == vector.Zero)
        {
            vector      contact_pos, contact_dir, hitNormal;
            int         contactComponent;
            float       hitFraction;
            Object      hitObject;
            
            m_RayEnd = m_RayStart + GetGame().GetCurrentCameraDirection() * c_RayDistance * 3;
            
            PhxInteractionLayers collisionLayerMask = PhxInteractionLayers.ROADWAY|PhxInteractionLayers.TERRAIN|PhxInteractionLayers.WATERLAYER;
            DayZPhysics.RayCastBullet(m_RayStart,m_RayEnd,collisionLayerMask,null,hitObject,contact_pos,hitNormal,hitFraction);
            m_HitPos = contact_pos;
        }
        
        m_Targets.Insert(new ActionTarget(null, null, -1, m_HitPos, 0));
 
#ifdef DIAG_DEVELOPER
        if (DiagMenu.GetBool(DiagMenuIDs.MISC_ACTION_TARGETS_DEBUG))
        {
            ShowDebugActionTargets(true);
            DrawDebugActionTargets(true);
            DrawDebugCone(true);
            DrawDebugRay(true);
            DrawSelectionPos(DiagMenu.GetBool(DiagMenuIDs.MISC_ACTION_TARGETS_SELPOS_DEBUG));
        }
        else
        {
            ShowDebugActionTargets(false);
            DrawDebugActionTargets(false);
            DrawDebugCone(false);
            DrawDebugRay(false);
            DrawSelectionPos(false);
        }
#endif
        //Print("--------------");
    }
    
    private bool IsObstructed(Object object)
    {
        IsObjectObstructedCache cache = new IsObjectObstructedCache(m_RayStart, 1);
        return IsObstructedEx(object, cache);
    }
    
    private bool IsObstructedEx(Object object, IsObjectObstructedCache cache)
    {
        return MiscGameplayFunctions.IsObjectObstructedEx(object, cache);
    }
    
    int GetTargetsCount()
        { return m_Targets.Count(); }
    
    ActionTarget GetTarget(int index)
        { return m_Targets.Get(index); }
 
    private void StoreTarget(ActionTarget pActionTarget)
    {
        int index = FindIndexForStoring(pActionTarget.GetUtility());
        m_Targets.InsertAt(pActionTarget, index);
        //Print("StoreTarget; object: " + pActionTarget.GetObject() + " | parent: " + pActionTarget.GetParent() + " | idx: " + index);
    }
 
    private int FindIndexForStoring(float value)
    {
        int left = 0;
        int right = m_Targets.Count() - 1;
        while ( left <= right )
        {
            int middle = (left + right) / 2;
            float middleValue = m_Targets.Get(middle).GetUtility();
            
            if ( middleValue == value )
                return middle;
            else if ( middleValue < value )
                right = middle - 1;
            else
                left = middle + 1;
        }
        
        return left;
    }
    
    private float ComputeUtility(Object pTarget, vector pRayStart, vector pRayEnd, Object cursorTarget, vector hitPos, SurfaceInfo surfaceInfo)
    {
        if (vector.DistanceSq(hitPos, m_Player.GetPosition()) > c_MaxTargetDistance * c_MaxTargetDistance)
            return -1;
 
        if (pTarget)
        {
            if (pTarget == cursorTarget)
            {
                if (pTarget.GetType() == string.Empty)
                    return 0.01;
 
                if (pTarget.IsBuilding())
                    return 0.25;
 
                if (pTarget.IsTransport())
                    return 0.25;
                
                if (pTarget.CanUseConstruction())
                    return 0.85;
 
                if (pTarget.IsWell())
                    return 0.9;
 
                vector playerPosXZ = m_Player.GetPosition();
                vector hitPosXZ = hitPos;
                playerPosXZ[1] = 0;
                hitPosXZ[1] = 0;
                if (vector.DistanceSq(playerPosXZ, hitPosXZ) <= c_MaxTargetDistance * c_MaxTargetDistance)
                    return c_UtilityMaxValue;
            }
 
            if ( PlayerBase.Cast(pTarget) && PlayerBase.Cast(pTarget).IsInVehicle() ) // utility in vehicle should be below base vehicle val
                return 0.20;
            
            float distSqr = DistSqrPoint2Line(pTarget.GetPosition(), pRayStart, pRayEnd);
            return (c_UtilityMaxDistFromRaySqr - distSqr) / c_UtilityMaxDistFromRaySqr;
        }
        
        if (surfaceInfo && surfaceInfo.GetLiquidType() != LIQUID_NONE)
            return 0.01;
 
        return -1;
    }
 
    private float DistSqrPoint2Line(vector pPoint, vector pL1, vector pL2)
    {
        vector v = pL2 - pL1;
        vector w = pPoint - pL1;
    
        float c1 = vector.Dot(w,v);
        float c2 = vector.Dot(v,v);
 
        if ( c1 <= 0 || c2 == 0 )
            return vector.DistanceSq(pPoint, pL1);
 
        float b = c1 / c2;  
        vector nearestPoint = pL1 + (v * b);
        return vector.DistanceSq(pPoint, nearestPoint);     
    }
    
    private void FilterObstructedObjectsEx(Object cursor_target, array<Object> vicinityObjects)
    {
        #ifdef DIAG_DEVELOPER
        if (DiagMenu.GetBool(DiagMenuIDs.MISC_ACTION_TARGETS_DEBUG))
            CleanupDebugShapes(obstruction);
        #endif
 
        array<Object> obstructingObjects = new array<Object>;
        MiscGameplayFunctions.FilterObstructingObjects(vicinityObjects, obstructingObjects);
        
        if ( obstructingObjects.Count() > 0 )
        {
            PlayerBase player = PlayerBase.Cast(g_Game.GetPlayer());
                    
            int numObstructed = 0;
            int mCount = m_VicinityObjects.Count();
            
            if (mCount > GROUPING_COUNT_THRESHOLD)
            {
                array<Object> filteredObjects = new array<Object>;
                MiscGameplayFunctions.FilterObstructedObjectsByGrouping(m_RayStart, c_MaxTargetDistance, c_DistanceDelta, m_VicinityObjects.GetRawVicinityObjects(), vicinityObjects, filteredObjects);
                m_VicinityObjects.ClearVicinityObjects();
                m_VicinityObjects.TransformToVicinityObjects(filteredObjects);
            }
            else
            {
                FilterObstructedObjects(cursor_target);
            }
        }
    }
    
    private void FilterObstructedObjects(Object cursor_target)
    {
        int numObstructed = 0;
        int mCount = m_VicinityObjects.Count();
        IsObjectObstructedCache cache = new IsObjectObstructedCache(m_RayStart, mCount);
        mCount--;
    
        for ( int i = mCount; i >= 0; --i )
        {
            Object object = m_VicinityObjects.GetObject(i);
            Object parent = m_VicinityObjects.GetParent(i);
 
            if (object && !parent)
            {
                if (numObstructed > OBSTRUCTED_COUNT_THRESHOLD && object != cursor_target)
                {
                    m_VicinityObjects.Remove(object);
                    continue;
                }
 
                if (object != cursor_target && IsObstructedEx(object, cache))
                {
                    m_VicinityObjects.Remove(object);
                    numObstructed++;
                }
 
                cache.ClearCache();
            }
        }
    }
    
#ifdef DIAG_DEVELOPER
    ref array<Shape> shapes = new array<Shape>();
    ref array<Shape> dbgConeShapes = new array<Shape>();
    ref array<Shape> rayShapes = new array<Shape>();
    ref array<Shape> obstruction = new array<Shape>();
    ref array<Shape> dbgPosShapes = new array<Shape>();
    
    void ShowDebugActionTargets(bool enabled)
    {
        int windowPosX = 0;
        int windowPosY = 50;
 
        Object obj;
 
        DbgUI.BeginCleanupScope();
        DbgUI.Begin("Action Targets", windowPosX, windowPosY);
        if ( enabled )
        {
            for ( int i = 0; i < GetTargetsCount(); i++ )
            {               
                obj = m_Targets.Get(i).GetObject();
                if ( obj )
                {
                    float util = m_Targets.Get(i).GetUtility();
                    int compIdx = m_Targets.Get(i).GetComponentIndex();
                    string compName;
                    array<string> compNames = new array<string>;
                    compName = obj.GetActionComponentName(compIdx);
                    obj.GetActionComponentNameList(compIdx, compNames);
 
                    if ( compNames.Count() > 0 )
                    {
                        for ( int c = 0; c < compNames.Count(); c++ )
                        {
                            DbgUI.Text(obj.GetDisplayName() + " :: " + obj + " | util: " + util + " | compIdx: " + compIdx + " | compName: " + compNames[c] + "| wPos: " + obj.GetWorldPosition() );
                        }
                    }
                    else
                    {
                        DbgUI.Text(obj.GetDisplayName() + " :: " + obj + " | util: " + util + " | compIdx: " + compIdx + " | compName: " + compName + "| wPos: " + obj.GetWorldPosition() );                    
                    }
                }
                else
                    continue;
            }
        }
        DbgUI.End();
        DbgUI.EndCleanupScope();
    }
 
    void DrawDebugActionTargets(bool enabled)
    {
        int s_id;
        vector w_pos;
        vector w_pos_sphr;
        vector w_pos_lend;
        Object obj;
 
        if ( enabled )
        {
            CleanupDebugShapes(shapes);
            
            for ( int i = 0; i < GetTargetsCount(); i++ )
            {
                obj = m_Targets.Get(i).GetObject();
                if ( obj )
                {
                    w_pos = obj.GetPosition();
                    // sphere pos tweaks
                    w_pos_sphr = w_pos;
                    w_pos_sphr[1] = w_pos_sphr[1] + 0.5;
                    // line pos tweaks
                    w_pos_lend = w_pos;
                    w_pos_lend[1] = w_pos_lend[1] + 0.5;
                    
                    if ( i == 0 )
                    {
                        shapes.Insert( Debug.DrawSphere(w_pos_sphr, 0.03, COLOR_RED) );
                        shapes.Insert( Debug.DrawLine(w_pos, w_pos_lend, COLOR_RED) );
                    }
                    else
                    {
                        shapes.Insert( Debug.DrawSphere(w_pos_sphr, 0.03, COLOR_YELLOW) );
                        shapes.Insert( Debug.DrawLine(w_pos, w_pos_lend, COLOR_YELLOW) );
                    }
                }
            }
        }
        else
            CleanupDebugShapes(shapes);
    }
    
    private void DrawDebugCone(bool enabled)
    {
        // "cone" settings
        vector start, end, endL, endR;
        float playerAngle;
        float xL,xR,zL,zR;
        
        if (enabled)
        {
            CleanupDebugShapes(dbgConeShapes);
 
            start = m_Player.GetPosition();
            playerAngle = MiscGameplayFunctions.GetHeadingAngle(m_Player);
            
            // offset position of the shape in height
            start[1] = start[1] + 0.2;
 
            endL = start;
            endR = start;
            xL = c_MaxTargetDistance * Math.Cos(playerAngle + Math.PI_HALF + c_ConeAngle * Math.DEG2RAD); // x
            zL = c_MaxTargetDistance * Math.Sin(playerAngle + Math.PI_HALF + c_ConeAngle * Math.DEG2RAD); // z
            xR = c_MaxTargetDistance * Math.Cos(playerAngle + Math.PI_HALF - c_ConeAngle * Math.DEG2RAD); // x
            zR = c_MaxTargetDistance * Math.Sin(playerAngle + Math.PI_HALF - c_ConeAngle * Math.DEG2RAD); // z
            endL[0] = endL[0] + xL;
            endL[2] = endL[2] + zL;
            endR[0] = endR[0] + xR;
            endR[2] = endR[2] + zR;
 
            dbgConeShapes.Insert( Debug.DrawLine(start, endL, COLOR_BLUE) );
            dbgConeShapes.Insert( Debug.DrawLine(start, endR, COLOR_BLUE) ) ;
            dbgConeShapes.Insert( Debug.DrawLine(endL, endR, COLOR_BLUE) );
        }
        else
            CleanupDebugShapes(dbgConeShapes);      
    }
    
    private void DrawSelectionPos(bool enabled)
    {
        if (enabled)
        {
            CleanupDebugShapes(dbgPosShapes);
            if (GetTargetsCount() > 0 && GetTarget(0).GetUtility() > -1 )
            {
                ActionTarget at = GetTarget(0);
                if (at.GetObject())
                {
                    string compName = at.GetObject().GetActionComponentName(at.GetComponentIndex());
                    vector modelPos = at.GetObject().GetSelectionPositionMS(compName);
                    vector worldPos = at.GetObject().ModelToWorld(modelPos);
                    dbgPosShapes.Insert( Debug.DrawSphere(worldPos, 0.25, Colors.PURPLE, ShapeFlags.NOZBUFFER) );
                }
            }
        }
        else
            CleanupDebugShapes(dbgPosShapes);
    }
 
    private void DrawDebugRay(bool enabled)
    {
        if (enabled)
        {
            CleanupDebugShapes(rayShapes);
            rayShapes.Insert( Debug.DrawSphere(m_HitPos, Math.Sqrt(c_UtilityMaxDistFromRaySqr), COLOR_BLUE_A, ShapeFlags.TRANSP) );
            rayShapes.Insert( Debug.DrawLine(m_RayStart, m_RayEnd, COLOR_BLUE) );
        }
        else
            CleanupDebugShapes(rayShapes);
    }
 
    private void CleanupDebugShapes(array<Shape> shapesArr)
    {
        for ( int it = 0; it < shapesArr.Count(); ++it )
        {
            Debug.RemoveShape( shapesArr[it] );
        }
        
        shapesArr.Clear();
    }
#endif
    
    //--------------------------------------------------------
    // Members
    //--------------------------------------------------------
    private PlayerBase m_Player;
    
    private ref array<ref ActionTarget> m_Targets;
    
    static private ref VicinityObjects m_VicinityObjects
 
    private bool m_Debug
    
    private vector m_RayStart;
    private vector m_RayEnd;
    private vector m_HitPos;
    
    private SurfaceInfo m_SurfaceInfo;
    
    //--------------------------------------------------------
    // Constants
    //--------------------------------------------------------
    private const float c_RayDistance = 5.0;
    private const float c_MaxTargetDistance = 3.0;
    private const float c_MaxActionDistance = UAMaxDistances.DEFAULT;
    private const float c_ConeAngle = 30.0;
    private const float c_ConeHeightMin = -0.5;
    private const float c_ConeHeightMax = 2.0;
    private const float c_DistanceDelta = 0.3;
    
    private const float c_UtilityMaxValue = 10000;
    private const float c_UtilityMaxDistFromRaySqr = 0.8 * 0.8;
 
    private const string CE_CENTER                  = "ce_center";
    private const float HEIGHT_OFFSET               = 0.2;
    
    private const int OBSTRUCTED_COUNT_THRESHOLD    = 3;
    private const int GROUPING_COUNT_THRESHOLD      = 10;
    
    vector CalculateRayStart();
};
 
class ObjectGroup
{
    ref array<Object> Objects = new array<Object>;
}