Problem Implementing Texture on Libgdx Mesh of Randomized Terrain

Problem Implementing Texture on Libgdx Mesh of Randomized Terrain

I'm having problems understanding how to apply a texture to a non-rectangular object. The following code creates textures such as this:

from the debug renderer I think I've got the physical shape of the "earth" correct. However, I don't know how to apply a texture to it. I have a 50x50 pixel image (in the environment constructor as "dirt.png"), that I want to apply to the hills. I have a vague idea that this seems to involve the mesh class and possibly a ShapeRenderer, but the little i'm finding online is just confusing me.
Bellow is code from the class that makes and regulates the terrain and the code in a separate file that is supposed to render it (but crashes on the mesh.render() call). Any pointers would be appreciated.
public class Environment extends Actor{
      Pixmap sky;
      public Texture groundTexture;
      Texture skyTexture;
      double tankypos; //TODO delete, temp
      public Tank etank; //TODO delete, temp
      int destructionRes; // how wide is a static pixel
      private final float viewWidth;
      private final float viewHeight;
      private ChainShape terrain;
      public Texture dirtTexture;
      private World world;
      public Mesh terrainMesh;

      private static final String LOG = Environment.class.getSimpleName();

      // Constructor
      public Environment(Tank tank, FileHandle sfileHandle, float w, float h, int destructionRes) {
        world = new World(new Vector2(0, -10), true);
        this.destructionRes = destructionRes;
        sky = new Pixmap(sfileHandle);
        viewWidth = w;
        viewHeight = h;
        skyTexture = new Texture(sky);
        terrain = new ChainShape();
        genTerrain((int)w, (int)h, 6);

        Texture tankSprite = new Texture(Gdx.files.internal("TankSpriteBase.png"));
        Texture turretSprite = new Texture(Gdx.files.internal("TankSpriteTurret.png"));
        tank = new Tank(0, true, tankSprite, turretSprite);
        Rectangle tankrect = new Rectangle(300, (int)tankypos, 44, 45);
        tank.setRect(tankrect);

        BodyDef terrainDef = new BodyDef(); 
        terrainDef.type = BodyType.StaticBody; 
        terrainDef.position.set(0, 0); 
        Body terrainBody = world.createBody(terrainDef);

        FixtureDef fixtureDef = new FixtureDef(); 
        fixtureDef.shape = terrain;
        terrainBody.createFixture(fixtureDef);

        BodyDef tankDef = new BodyDef();
        Rectangle rect = tank.getRect();
        tankDef.type = BodyType.DynamicBody;
        tankDef.position.set(0,0);
        tankDef.position.x = rect.x;
        tankDef.position.y = rect.y;
        Body tankBody = world.createBody(tankDef);

        FixtureDef tankFixture = new FixtureDef();
        PolygonShape shape = new PolygonShape();
        shape.setAsBox(rect.width*WORLD_TO_BOX, rect.height*WORLD_TO_BOX);
        fixtureDef.shape = shape;

        dirtTexture = new Texture(Gdx.files.internal("dirt.png"));
        etank = tank;
      }

      private void genTerrain(int w, int h, int hillnessFactor){
            int width = w;
            int height = h;

            Random rand = new Random();
            //min and max bracket the freq's of the sin/cos series