IntersectRay crashfix patchfile

2012_12_27_core_intersectray_crashfix.patch

From f4c741dfccbd270c669bf7e4f9b5f7c4a745d00f Mon Sep 17 00:00:00 2001
From: Eilo <eilo2518@gmail.com>
Date: Thu, 27 Dec 2012 23:29:13 -0500
Subject: [PATCH] Core/Model: Fix crashes on IntersectRay, original patch and idea by MrSmite

---
 src/server/collision/BoundingIntervalHierarchy.h |  3 +++
 src/server/collision/Models/GameObjectModel.cpp  | 16 +++++++++-------
 src/server/collision/Models/WorldModel.cpp       | 10 +++++++---
 4 files changed, 20 insertions(+), 10 deletions(-)

 ########################
diff --git a/src/server/collision/BoundingIntervalHierarchy.h b/src/server/collision/BoundingIntervalHierarchy.h
index a4bbe21..2d6e3c7 100755
--- a/src/server/collision/BoundingIntervalHierarchy.h
+++ b/src/server/collision/BoundingIntervalHierarchy.h
@@ -350,6 +350,9 @@ class BIH
         bool writeToFile(FILE* wf) const;
         bool readFromFile(FILE* rf);
 
+        bool IsTreeEmpty() const { return tree.empty(); }
+        bool IsObjectsEmpty() const { return objects.empty(); }
+
     protected:
         std::vector<uint32> tree;
         std::vector<uint32> objects;
diff --git a/src/server/collision/Models/GameObjectModel.cpp b/src/server/collision/Models/GameObjectModel.cpp
index d8c3992..c29aa7f 100644
--- a/src/server/collision/Models/GameObjectModel.cpp
+++ b/src/server/collision/Models/GameObjectModel.cpp
@@ -175,13 +175,15 @@ bool GameObjectModel::intersectRay(const G3D::Ray& ray, float& MaxDist, bool Sto
     Vector3 p = iInvRot * (ray.origin() - iPos) * iInvScale;
     Ray modRay(p, iInvRot * ray.direction());
     float distance = MaxDist * iInvScale;
-    bool hit = iModel->IntersectRay(modRay, distance, StopAtFirstHit);
-    if (hit)
-    {
-        distance *= iScale;
-        MaxDist = distance;
-    }
-    return hit;
+
+    if (iModel)
+        if (iModel->IntersectRay(modRay, distance, StopAtFirstHit))
+        {
+            distance *= iScale;
+            MaxDist = distance;
+            return true;
+        }
+    return false;
 }
 
 #endif
diff --git a/src/server/collision/Models/WorldModel.cpp b/src/server/collision/Models/WorldModel.cpp
index b4f3f73..356b7c4 100644
--- a/src/server/collision/Models/WorldModel.cpp
+++ b/src/server/collision/Models/WorldModel.cpp
@@ -425,9 +425,13 @@ namespace VMAP
         if (groupModels.size() == 1)
             return groupModels[0].IntersectRay(ray, distance, stopAtFirstHit);
 
-        WModelRayCallBack isc(groupModels);
-        groupTree.intersectRay(ray, isc, distance, stopAtFirstHit);
-        return isc.hit;
+        if (!groupTree.IsObjectsEmpty() && !groupTree.IsTreeEmpty())
+        {
+            WModelRayCallBack isc(groupModels);
+            groupTree.intersectRay(ray, isc, distance, stopAtFirstHit);
+            return isc.hit;
+        }
+        return false;
     }
 
     class WModelAreaCallback {
-- 
1.7.11.msysgit.1