Added assignment 6 directory and worksheet

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diff --git a/dev/a6-harold/ground.h b/dev/a6-harold/ground.h
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+/** CSci-4611 Assignment 6: Harold
+ */
+
+#ifndef GROUND_H_
+#define GROUND_H_
+
+#include <mingfx.h>
+using namespace mingfx;
+
+#include "edge_mesh.h"
+
+/** The ground is represented with a triangle mesh.  2D "screen space" strokes
+ are used to modify the vertices based on user input so that the user can create
+ a 3D landscape of hills and valleys.
+ */
+class Ground {
+public:
+    Ground();
+    virtual ~Ground();
+    
+    /// Call from InitOpenGL() to initialize shaders, etc.
+    void Init(const std::vector<std::string> &search_path);
+    
+    /// Projects a 2D normalized screen point (e.g., the mouse position in normalized
+    /// device coordinates) to a 3D point on the ground.  Returns true and sets ground_point
+    /// to be equal to the result if the conversion is successful.  Returns false if
+    /// the screen point does not project onto the ground.
+    bool ScreenPtHitsGround(const Matrix4 &view_matrix, const Matrix4 &proj_matrix,
+                          const Point2 &normalized_screen_pt, Point3 *ground_point);
+
+    /// Modifies the vertices of the ground mesh to create a hill or valley based
+    /// on the input stroke.  The 2D path of the stroke on the screen is passed
+    /// in, this is the centerline of the stroke mesh that is actually drawn on
+    /// the screen while the user is drawing.
+    void ReshapeGround(const Matrix4 &view_matrix, const Matrix4 &proj_matrix,
+                       const std::vector<Point2> &stroke2d);
+    
+    /// Draws the ground mesh with toon shading
+    void Draw(const Matrix4 &view_matrix, const Matrix4 &proj_matrix, const Color &ground_color);
+    
+    
+    Mesh* mesh_ptr();
+    
+private:
+    
+    // This is the actual triangle mesh for the ground
+    Mesh ground_mesh_;
+    // We also maintain a corresponding "edge mesh" in order to do the
+    // silhouette outlines like in assignment 5
+    EdgeMesh ground_edge_mesh_;
+    
+    // The ground rendering is based on the artsy shader from assignment 5
+    ShaderProgram artsy_shaderprog_;
+    ShaderProgram outline_shaderprog_;
+    Texture2D diffuse_ramp_;
+    Texture2D specular_ramp_;
+    Point3 light_pos_;
+    
+    // for debugging only
+    QuickShapes qs_;
+};
+
+#endif