🎮 How To Use
-
Select a Mesh object in the scene
-
Open
Tools → Simple Mesh Modifier -
Set Selection Radius
-
Click Select Vertices by Radius
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Adjust Scale
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Click Scale Selected Vertices
Red dots show selected vertices in Scene View.
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
public class SimpleMeshModifier : EditorWindow
{
GameObject targetObject;
Mesh mesh;
Vector3[] vertices;
float selectionRadius = 0.5f;
Vector3 scale = Vector3.one * 1.2f;
List<int> selectedVertices = new List<int>();
[MenuItem("Tools/Simple Mesh Modifier")]
static void Open()
{
GetWindow<SimpleMeshModifier>("Mesh Modifier");
}
void OnGUI()
{
GUILayout.Label("Simple Mesh Modifier", EditorStyles.boldLabel);
targetObject = (GameObject)EditorGUILayout.ObjectField(
"Target Object",
targetObject,
typeof(GameObject),
true
);
selectionRadius = EditorGUILayout.FloatField("Selection Radius", selectionRadius);
scale = EditorGUILayout.Vector3Field("Scale", scale);
if (GUILayout.Button("Select Vertices by Radius"))
{
SelectVertices();
}
if (GUILayout.Button("Scale Selected Vertices"))
{
ScaleVertices();
}
GUILayout.Label($"Selected Vertices: {selectedVertices.Count}");
}
void SelectVertices()
{
selectedVertices.Clear();
if (!ValidateMesh()) return;
Vector3 center = targetObject.transform.position;
for (int i = 0; i < vertices.Length; i++)
{
Vector3 worldPos = targetObject.transform.TransformPoint(vertices[i]);
if (Vector3.Distance(worldPos, center) <= selectionRadius)
{
selectedVertices.Add(i);
}
}
SceneView.RepaintAll();
}
void ScaleVertices()
{
if (!ValidateMesh() || selectedVertices.Count == 0) return;
Undo.RecordObject(mesh, "Scale Vertices");
Vector3 center = Vector3.zero;
foreach (int i in selectedVertices)
center += vertices[i];
center /= selectedVertices.Count;
foreach (int i in selectedVertices)
{
Vector3 dir = vertices[i] - center;
vertices[i] = center + Vector3.Scale(dir, scale);
}
mesh.vertices = vertices;
mesh.RecalculateNormals();
mesh.RecalculateBounds();
EditorUtility.SetDirty(mesh);
}
bool ValidateMesh()
{
if (!targetObject) return false;
MeshFilter mf = targetObject.GetComponent<MeshFilter>();
if (!mf || !mf.sharedMesh) return false;
// Duplicate mesh so original asset is not modified
mesh = Instantiate(mf.sharedMesh);
mf.sharedMesh = mesh;
vertices = mesh.vertices;
return true;
}
void OnSceneGUI(SceneView sceneView)
{
if (!targetObject || vertices == null) return;
Handles.color = Color.red;
foreach (int i in selectedVertices)
{
Vector3 worldPos = targetObject.transform.TransformPoint(vertices[i]);
Handles.SphereHandleCap(
0,
worldPos,
Quaternion.identity,
0.02f,
EventType.Repaint
);
}
}
void OnEnable()
{
SceneView.duringSceneGui += OnSceneGUI;
}
void OnDisable()
{
SceneView.duringSceneGui -= OnSceneGUI;
}
}