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Assets/NavMesh/Examples/Scripts/MeshTool.cs

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+using UnityEngine;
+using System.Collections.Generic;
+
+// Manipulation tool for displacing the vertices in a list of meshes
+public class MeshTool : MonoBehaviour
+{
+    public enum ExtrudeMethod
+    {
+        Vertical,
+        MeshNormal
+    }
+
+    public List<MeshFilter> m_Filters = new List<MeshFilter>();
+    public float m_Radius = 1.5f;
+    public float m_Power = 2.0f;
+    public ExtrudeMethod m_Method = ExtrudeMethod.Vertical;
+
+    RaycastHit m_HitInfo = new RaycastHit();
+
+    void Start()
+    {
+        Cursor.lockState = CursorLockMode.Locked;
+        Cursor.visible = false;
+    }
+
+    void Update()
+    {
+        var ray = new Ray(Camera.main.transform.position, Camera.main.transform.forward);
+        if (Physics.Raycast(ray.origin, ray.direction, out m_HitInfo))
+        {
+            Debug.DrawRay(m_HitInfo.point, m_HitInfo.normal, Color.red);
+            Vector3 displacement = (m_Method == ExtrudeMethod.Vertical) ? Vector3.up : m_HitInfo.normal;
+
+            if (Input.GetMouseButton(0) || (Input.GetKey(KeyCode.Space) && !Input.GetKey(KeyCode.LeftShift)))
+                ModifyMesh(m_Power * displacement, m_HitInfo.point);
+            if (Input.GetMouseButton(1) || (Input.GetKey(KeyCode.Space) && Input.GetKey(KeyCode.LeftShift)))
+                ModifyMesh(-m_Power * displacement, m_HitInfo.point);
+        }
+    }
+
+    void ModifyMesh(Vector3 displacement, Vector3 center)
+    {
+        foreach (var filter in m_Filters)
+        {
+            Mesh mesh = filter.mesh;
+            Vector3[] vertices = mesh.vertices;
+
+            for (int i = 0; i < vertices.Length; ++i)
+            {
+                Vector3 v = filter.transform.TransformPoint(vertices[i]);
+                vertices[i] = vertices[i] + displacement * Gaussian(v, center, m_Radius);
+            }
+
+            mesh.vertices = vertices;
+            mesh.RecalculateBounds();
+
+            var col = filter.GetComponent<MeshCollider>();
+            if (col != null)
+            {
+                var colliMesh = new Mesh();
+                colliMesh.vertices = mesh.vertices;
+                colliMesh.triangles = mesh.triangles;
+                col.sharedMesh = colliMesh;
+            }
+        }
+    }
+
+    static float Gaussian(Vector3 pos, Vector3 mean, float dev)
+    {
+        float x = pos.x - mean.x;
+        float y = pos.y - mean.y;
+        float z = pos.z - mean.z;
+        float n = 1.0f / (2.0f * Mathf.PI * dev * dev);
+        return n * Mathf.Pow(2.718281828f, -(x * x + y * y + z * z) / (2.0f * dev * dev));
+    }
+}