diff --git a/cpp/inputgeom.cc b/cpp/inputgeom.cc
index deb29d2..268b9d5 100644
--- a/cpp/inputgeom.cc
+++ b/cpp/inputgeom.cc
@@ -1,5 +1,7 @@
 #include "precompile.h"
 
+#include "Recast.h"
+
 #include "inputgeom.h"
 
 struct BoundsItem
@@ -224,7 +226,38 @@ namespace f8
 
     void InputGeom::Init(float width, float height)
     {
+        {
+            verts_.reserve(3 * 4);
 
+            verts_.push_back(0);
+            verts_.push_back(0);
+            verts_.push_back(0);
+
+            verts_.push_back(0);
+            verts_.push_back(0);
+            verts_.push_back(height);
+
+            verts_.push_back(width);
+            verts_.push_back(0);
+            verts_.push_back(height);
+
+            verts_.push_back(width);
+            verts_.push_back(0);
+            verts_.push_back(0);
+        }
+        {
+            tris_.push_back(0);
+            tris_.push_back(1);
+            tris_.push_back(2);
+
+            tris_.push_back(0);
+            tris_.push_back(2);
+            tris_.push_back(3);
+        }
+        rcCalcBounds(GetVerts(), GetVertCount(), min_, max_);
+	if (!rcCreateChunkyTriMesh(GetVerts(), GetTris(), GetTriCount(), 256, &chunky_mesh_)) {
+            abort();
+        }
     }
 
 }
diff --git a/cpp/inputgeom.h b/cpp/inputgeom.h
index bd9895b..67b5b27 100644
--- a/cpp/inputgeom.h
+++ b/cpp/inputgeom.h
@@ -36,13 +36,16 @@ namespace f8
         const float* GetMeshBoundsMin() const { return min_; }
         const float* GetMeshBoundsMax() const { return max_; }
         const float* GetVerts() const { return !verts_.empty() ? &verts_[0] : nullptr; }
-        int GetVertCount() const { return verts_.size(); }
+        int GetVertCount() const { return verts_.size() / 3; }
+	const int* GetTris() const { return !tris_.empty() ? &tris_[0] : nullptr; }
+	int GetTriCount() const { return tris_.size() / 3; }
         const rcChunkyTriMesh* GetChunkyMesh() { return &chunky_mesh_; }
 
     private:
         float min_[3] = {0};
         float max_[3] = {0};
         std::vector<float> verts_;
+        std::vector<int> tris_;
         rcChunkyTriMesh chunky_mesh_;
     };
 
@@ -51,3 +54,4 @@ namespace f8
 int rcGetChunksOverlappingRect(const rcChunkyTriMesh* cm,
                                float bmin[2], float bmax[2],
                                int* ids, const int maxIds);
+