using UnityEngine;

public class MoveVertices : MonoBehaviour {

    void Start () {
    }

    void Update() {

  if (Input.GetKeyDown ("space")) {
   Mesh mesh = GetComponent<MeshFilter> ().mesh;
   Vector3[] vertices = mesh.vertices;
   int i = 0;
   while (i < vertices.Length) {
    RaycastHit hit;
     if (Physics.Raycast (transform.TransformPoint (vertices [i]), -Vector3.up, out hit, 100.0f)) {
   
     Debug.DrawLine (transform.TransformPoint (vertices [i]), hit.point);

     vertices [i] = transform.InverseTransformPoint (hit.point);
    }
    i++;
   }
   mesh.vertices = vertices;
  }
    }
}