Core/Vmaps: Fix inconsistency of hitInstance and hitModel to cause wrong area ids (#28632)

Closes #28326

Co-authored-by: Gosha <284210+Lordron@users.noreply.github.com>

src/common/Collision/Maps/MapTree.h

@@ -31,6 +31,12 @@ namespace VMAP
     enum class LoadResult : uint8;
     enum class ModelIgnoreFlags : uint32;
 
+    struct GroupLocationInfo
+    {
+        const GroupModel* hitModel = nullptr;
+        int32 rootId = -1;
+    };
+
     struct TC_COMMON_API LocationInfo
     {
         LocationInfo(): rootId(-1), hitInstance(nullptr), hitModel(nullptr), ground_Z(-G3D::finf()) { }

src/common/Collision/Models/ModelInstance.cpp

@@ -116,7 +116,9 @@ namespace VMAP
         Vector3 pModel = iInvRot * (p - iPos) * iInvScale;
         Vector3 zDirModel = iInvRot * Vector3(0.f, 0.f, -1.f);
         float zDist;
-        if (iModel->GetLocationInfo(pModel, zDirModel, zDist, info))
+
+        GroupLocationInfo groupInfo;
+        if (iModel->GetLocationInfo(pModel, zDirModel, zDist, groupInfo))
         {
             Vector3 modelGround = pModel + zDist * zDirModel;
             // Transform back to world space. Note that:
@@ -125,6 +127,8 @@ namespace VMAP
             float world_Z = ((modelGround * iInvRot) * iScale + iPos).z;
             if (info.ground_Z < world_Z) // hm...could it be handled automatically with zDist at intersection?
             {
+                info.rootId = groupInfo.rootId;
+                info.hitModel = groupInfo.hitModel;
                 info.ground_Z = world_Z;
                 info.hitInstance = this;
                 return true;

src/common/Collision/Models/WorldModel.cpp

@@ -547,7 +547,7 @@ namespace VMAP
         return false;
     }
 
-    bool WorldModel::GetLocationInfo(const G3D::Vector3 &p, const G3D::Vector3 &down, float &dist, LocationInfo &info) const
+    bool WorldModel::GetLocationInfo(const G3D::Vector3 &p, const G3D::Vector3 &down, float &dist, GroupLocationInfo& info) const
     {
         if (groupModels.empty())
             return false;

src/common/Collision/Models/WorldModel.h

@@ -31,6 +31,7 @@ namespace VMAP
     class TreeNode;
     struct AreaInfo;
     struct LocationInfo;
+    struct GroupLocationInfo;
     enum class ModelIgnoreFlags : uint32;
 
     class TC_COMMON_API MeshTriangle
@@ -113,7 +114,7 @@ namespace VMAP
             void setRootWmoID(uint32 id) { RootWMOID = id; }
             bool IntersectRay(const G3D::Ray &ray, float &distance, bool stopAtFirstHit, ModelIgnoreFlags ignoreFlags) const;
             bool IntersectPoint(const G3D::Vector3 &p, const G3D::Vector3 &down, float &dist, AreaInfo &info) const;
-            bool GetLocationInfo(const G3D::Vector3 &p, const G3D::Vector3 &down, float &dist, LocationInfo &info) const;
+            bool GetLocationInfo(const G3D::Vector3 &p, const G3D::Vector3 &down, float &dist, GroupLocationInfo& info) const;
             bool writeFile(const std::string &filename);
             bool readFile(const std::string &filename);
             void getGroupModels(std::vector<GroupModel>& outGroupModels);