Add extruded mesh collider tool
This commit is contained in:
HungDK
@@ -0,0 +1,301 @@
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using System.Collections.Generic;
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using System.IO;
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using UnityEditor;
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using UnityEngine;
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public class MeshColliderGeneratorWindow : EditorWindow
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{
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private const string GeneratedMeshFolder = "Assets/GeneratedColliders";
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[SerializeField]
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private List<GameObject> targetRoots = new List<GameObject>();
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[SerializeField]
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private bool includeInactive = true;
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[SerializeField]
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private float xScale = 1f;
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[SerializeField]
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private bool skipIfExists = true;
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[SerializeField]
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private bool setConvex = false;
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[SerializeField]
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private bool extrudeAlongNormals = false;
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[SerializeField]
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private float extrusionDistance = 0f;
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private SerializedObject serializedObjectRef;
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private SerializedProperty targetsProp;
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[MenuItem("Tools/Mesh Collider Generator")]
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public static void ShowWindow()
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{
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var window = GetWindow<MeshColliderGeneratorWindow>(true, "Mesh Collider Generator");
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window.minSize = new Vector2(420, 320);
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window.Show();
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}
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private void OnEnable()
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{
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serializedObjectRef = new SerializedObject(this);
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targetsProp = serializedObjectRef.FindProperty("targetRoots");
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}
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private void OnGUI()
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{
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serializedObjectRef.Update();
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EditorGUILayout.LabelField("Target GameObjects", EditorStyles.boldLabel);
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EditorGUILayout.HelpBox("Assign one or more root GameObjects. All children will be scanned.", MessageType.Info);
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EditorGUILayout.PropertyField(targetsProp, true);
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EditorGUILayout.Space();
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EditorGUILayout.LabelField("Options", EditorStyles.boldLabel);
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includeInactive = EditorGUILayout.Toggle(new GUIContent("Include Inactive", "Scan inactive children too"), includeInactive);
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xScale = EditorGUILayout.FloatField(new GUIContent("X Scale", "Local X scale for the generated collider GameObject"), Mathf.Max(0f, xScale));
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skipIfExists = EditorGUILayout.Toggle(new GUIContent("Skip If MeshCollider Exists", "Skip if the target object already has a MeshCollider"), skipIfExists);
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setConvex = EditorGUILayout.Toggle(new GUIContent("Set Convex", "Set MeshCollider.convex on generated colliders"), setConvex);
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EditorGUILayout.Space();
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EditorGUILayout.LabelField("Extrusion", EditorStyles.boldLabel);
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extrudeAlongNormals = EditorGUILayout.Toggle(new GUIContent("Extrude Along Normals", "If enabled, duplicates the mesh and offsets vertices along their normals for the collider"), extrudeAlongNormals);
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using (new EditorGUI.DisabledScope(!extrudeAlongNormals))
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{
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extrusionDistance = EditorGUILayout.FloatField(new GUIContent("Extrusion Distance", "Distance to offset vertices along normals (units). Positive = expand, negative = shrink."), extrusionDistance);
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}
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EditorGUILayout.Space();
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using (new EditorGUI.DisabledScope(targetsProp.arraySize == 0))
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{
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if (GUILayout.Button("Scan And Generate"))
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{
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GenerateForTargets();
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}
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}
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serializedObjectRef.ApplyModifiedProperties();
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}
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private void GenerateForTargets()
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{
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var totalCreated = 0;
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try
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{
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Undo.IncrementCurrentGroup();
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var undoGroup = Undo.GetCurrentGroup();
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for (int i = 0; i < targetRoots.Count; i++)
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{
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var root = targetRoots[i];
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if (root == null)
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{
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continue;
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}
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var meshFilters = root.GetComponentsInChildren<MeshFilter>(includeInactive);
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foreach (var meshFilter in meshFilters)
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{
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if (meshFilter == null)
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{
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continue;
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}
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var meshRenderer = meshFilter.GetComponent<MeshRenderer>();
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if (meshRenderer == null)
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{
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continue;
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}
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var sourceMesh = meshFilter.sharedMesh;
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if (sourceMesh == null)
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{
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continue;
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}
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var parent = meshFilter.transform;
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var targetGo = parent.gameObject;
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if (skipIfExists && targetGo.GetComponent<MeshCollider>() != null)
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{
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continue;
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}
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var meshCollider = Undo.AddComponent<MeshCollider>(targetGo);
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var workingMesh = sourceMesh;
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if (extrudeAlongNormals && !Mathf.Approximately(extrusionDistance, 0f))
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{
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var extruded = CreateExtrudedMesh(workingMesh, extrusionDistance);
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if (extruded != null)
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{
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workingMesh = extruded;
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}
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}
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var uniformScale = Mathf.Approximately(xScale, 0f) ? 0.0001f : xScale;
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if (!Mathf.Approximately(uniformScale, 1f))
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{
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var scaled = CreateScaledMesh(workingMesh, uniformScale);
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if (scaled != null)
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{
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workingMesh = scaled;
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}
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}
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meshCollider.sharedMesh = workingMesh;
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meshCollider.convex = setConvex;
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totalCreated++;
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}
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}
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Undo.CollapseUndoOperations(Undo.GetCurrentGroup());
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EditorUtility.DisplayDialog("Mesh Collider Generator", $"Created {totalCreated} collider object(s).", "OK");
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}
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catch (System.SystemException e)
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{
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Debug.LogError($"Mesh Collider generation failed: {e.Message}\n{e}");
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}
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}
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private static Mesh CreateExtrudedMesh(Mesh source, float distance)
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{
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if (source == null)
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{
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return null;
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}
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if (!source.isReadable)
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{
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Debug.LogWarning($"Source mesh '{source.name}' is not readable. Using original mesh for collider.");
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return null;
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}
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var vertices = source.vertices;
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var normals = source.normals;
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var triangles = source.triangles;
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if (normals == null || normals.Length != vertices.Length)
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{
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var temp = new Mesh();
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temp.vertices = vertices;
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temp.triangles = triangles;
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temp.RecalculateNormals();
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normals = temp.normals;
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}
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var newVertices = new Vector3[vertices.Length];
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for (int i = 0; i < vertices.Length; i++)
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{
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newVertices[i] = vertices[i] + normals[i] * distance;
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}
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var extruded = new Mesh();
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extruded.name = string.IsNullOrEmpty(source.name) ? "ExtrudedMesh" : source.name + "_Extruded";
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extruded.vertices = newVertices;
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extruded.triangles = triangles;
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extruded.RecalculateBounds();
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SaveMeshAsset(extruded, source);
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return extruded;
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}
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private static Mesh CreateScaledMesh(Mesh source, float uniformScale)
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{
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if (source == null)
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{
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return null;
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}
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if (Mathf.Approximately(uniformScale, 1f))
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{
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return null;
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}
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if (!source.isReadable)
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{
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Debug.LogWarning($"Source mesh '{source.name}' is not readable. Using original mesh for collider.");
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return null;
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}
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var vertices = source.vertices;
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var triangles = source.triangles;
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var newVertices = new Vector3[vertices.Length];
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for (int i = 0; i < vertices.Length; i++)
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{
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newVertices[i] = vertices[i] * uniformScale;
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}
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var scaled = new Mesh();
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scaled.name = string.IsNullOrEmpty(source.name) ? "ScaledMesh" : source.name + "_Scaled_Collider";
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scaled.vertices = newVertices;
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scaled.triangles = triangles;
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scaled.RecalculateBounds();
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SaveMeshAsset(scaled, source);
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return scaled;
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}
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private static void SaveMeshAsset(Mesh mesh, Mesh sourceForPath)
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{
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if (mesh == null)
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{
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return;
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}
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string baseFolder = GeneratedMeshFolder;
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if (sourceForPath != null)
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{
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var srcPath = AssetDatabase.GetAssetPath(sourceForPath);
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if (!string.IsNullOrEmpty(srcPath))
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{
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var dir = Path.GetDirectoryName(srcPath);
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if (!string.IsNullOrEmpty(dir) && AssetDatabase.IsValidFolder(dir.Replace('\\','/')))
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{
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baseFolder = dir.Replace('\\','/');
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}
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}
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}
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if (!AssetDatabase.IsValidFolder(baseFolder))
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{
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// Fallback: ensure default folder exists
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if (!AssetDatabase.IsValidFolder(GeneratedMeshFolder))
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{
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var parts = GeneratedMeshFolder.Split('/');
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for (int i = 1; i < parts.Length; i++)
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{
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var parentPath = string.Join("/", parts, 0, i);
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var thisFolder = string.Join("/", parts, 0, i + 1);
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if (!AssetDatabase.IsValidFolder(thisFolder))
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{
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AssetDatabase.CreateFolder(parentPath, parts[i]);
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}
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}
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}
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baseFolder = GeneratedMeshFolder;
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}
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var sanitizedName = SanitizeFileName(string.IsNullOrEmpty(mesh.name) ? "GeneratedMesh" : mesh.name);
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var combined = baseFolder.EndsWith("/") ? baseFolder + sanitizedName + ".asset" : baseFolder + "/" + sanitizedName + ".asset";
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var path = AssetDatabase.GenerateUniqueAssetPath(combined.Replace('\\','/'));
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AssetDatabase.CreateAsset(mesh, path);
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AssetDatabase.SaveAssets();
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}
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private static string SanitizeFileName(string name)
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{
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foreach (var c in Path.GetInvalidFileNameChars())
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{
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name = name.Replace(c, '_');
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}
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return name;
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}
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}
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@@ -0,0 +1,2 @@
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fileFormatVersion: 2
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guid: cc28fa1b89fc42f4a96da9be095c6012
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