diff --git a/include/Collision/CCollisionInfoList.hpp b/include/Collision/CCollisionInfoList.hpp
new file mode 100644
index 00000000..aedc4bb4
--- /dev/null
+++ b/include/Collision/CCollisionInfoList.hpp
@@ -0,0 +1,30 @@
+#ifndef _CCOLLISIONINFOLIST
+#define _CCOLLISIONINFOLIST
+
+#include "Collision/CCollisionInfo.hpp"
+
+#include "rstl/reserved_vector.hpp"
+
+class CCollisionInfoList {
+  rstl::reserved_vector< CCollisionInfo, 32 > x0_list;
+
+public:
+  typedef rstl::reserved_vector< CCollisionInfo, 32 >::iterator iterator;
+  typedef rstl::reserved_vector< CCollisionInfo, 32 >::const_iterator const_iterator;
+
+  void Add(const CCollisionInfo& info, bool swap) {
+    if (x0_list.size() == 32)
+      return;
+    if (!swap)
+      x0_list.push_back(info);
+    else
+      x0_list.push_back(info.GetSwapped());
+  }
+
+  iterator end() { return x0_list.end(); }
+  const_iterator end() const { return x0_list.end(); }
+  iterator begin() { return x0_list.begin(); }
+  const_iterator begin() const { return x0_list.begin(); }
+};
+
+#endif // _CCOLLISIONINFOLIST
diff --git a/include/MetroidPrime/CAABoxFilter.hpp b/include/MetroidPrime/CAABoxFilter.hpp
new file mode 100644
index 00000000..0f00551c
--- /dev/null
+++ b/include/MetroidPrime/CAABoxFilter.hpp
@@ -0,0 +1,15 @@
+#ifndef _CAABOXFILTER
+#define _CAABOXFILTER
+
+#include "MetroidPrime/ICollisionFilter.hpp"
+
+class CCollisionInfoList;
+
+class CAABoxFilter : public ICollisionFilter {
+public:
+  explicit CAABoxFilter(CActor& actor) : ICollisionFilter(actor) {}
+  static void FilterBoxFloorCollisions(const CCollisionInfoList& in, CCollisionInfoList& out);
+  void Filter(const CCollisionInfoList& in, CCollisionInfoList& out) const;
+};
+
+#endif // _CAABOXFILTER
diff --git a/src/MetroidPrime/CAABoxFilter.cpp b/src/MetroidPrime/CAABoxFilter.cpp
new file mode 100644
index 00000000..2da80a5a
--- /dev/null
+++ b/src/MetroidPrime/CAABoxFilter.cpp
@@ -0,0 +1,30 @@
+#include "MetroidPrime/CAABoxFilter.hpp"
+
+#include "Collision/CCollisionInfoList.hpp"
+#include "Collision/CollisionUtil.hpp"
+
+void CAABoxFilter::FilterBoxFloorCollisions(const CCollisionInfoList& in, CCollisionInfoList& out) {
+  float minZ = 10000.f;
+
+  for (CCollisionInfoList::const_iterator it = in.begin(); it != in.end(); ++it) {
+    if (it->GetMaterialLeft().HasMaterial(kMT_Wall) && it->GetPoint().GetZ() < minZ) {
+      minZ = it->GetPoint().GetZ();
+    }
+  }
+
+  CCollisionInfoList temp;
+  for (CCollisionInfoList::const_iterator it = in.begin(); it != in.end(); ++it) {
+    if (it->GetMaterialLeft().HasMaterial(kMT_Floor)) {
+      if (it->GetPoint().GetZ() < minZ) {
+        temp.Add(*it, false);
+      }
+    } else {
+      temp.Add(*it, false);
+    }
+  }
+  CollisionUtil::AddAverageToFront(temp, out);
+}
+
+void CAABoxFilter::Filter(const CCollisionInfoList& in, CCollisionInfoList& out) const {
+  FilterBoxFloorCollisions(in, out);
+}