681 lines
26 KiB
C#
681 lines
26 KiB
C#
/************************************************************************************
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Filename : ONSPPropagationGeometry.cs
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Content : Geometry Functions
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Attach to a game object with meshes and material scripts to create geometry
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NOTE: ensure that Oculus Spatialization is enabled for AudioSource components
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Copyright : Copyright (c) Facebook Technologies, LLC and its affiliates. All rights reserved.
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Licensed under the Oculus SDK Version 3.5 (the "License");
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you may not use the Oculus SDK except in compliance with the License,
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which is provided at the time of installation or download, or which
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otherwise accompanies this software in either electronic or hard copy form.
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You may obtain a copy of the License at
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https://developer.oculus.com/licenses/sdk-3.5/
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Unless required by applicable law or agreed to in writing, the Oculus SDK
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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************************************************************************************/
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#define INCLUDE_TERRAIN_TREES
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using UnityEngine;
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using System;
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using System.Collections.Generic;
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using Oculus.Spatializer.Propagation;
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public class ONSPPropagationGeometry : MonoBehaviour
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{
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public static string GeometryAssetDirectory = "AudioGeometry";
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public static string GeometryAssetPath { get { return Application.streamingAssetsPath + "/" + GeometryAssetDirectory; } }
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//-------
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// PUBLIC
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/// The path to the serialized mesh file that holds the preprocessed mesh geometry.
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public string filePathRelative = "";
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public string filePath { get { return GeometryAssetPath + "/" + filePathRelative; } }
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public bool fileEnabled = false;
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public bool includeChildMeshes = true;
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//-------
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// PRIVATE
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private IntPtr geometryHandle = IntPtr.Zero;
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//-------
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// PUBLIC STATIC
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public static int OSPSuccess = 0;
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public const string GEOMETRY_FILE_EXTENSION = "ovramesh";
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private static string GetPath(Transform current)
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{
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if (current.parent == null)
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return current.gameObject.scene.name + "/" + current.name;
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return GetPath(current.parent) + "-" + current.name;
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}
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/// <summary>
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/// If script is attached to a gameobject, it will try to create geometry
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/// </summary>
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void Awake()
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{
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CreatePropagationGeometry();
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}
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/// <summary>
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/// Call this function to create geometry handle
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/// </summary>
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void CreatePropagationGeometry()
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{
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// Create Geometry
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if (ONSPPropagation.Interface.CreateAudioGeometry(out geometryHandle) != OSPSuccess)
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{
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throw new Exception("Unable to create geometry handle");
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}
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// Upload Mesh
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if (filePath != null && filePath.Length != 0 && fileEnabled && Application.isPlaying)
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{
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if (!ReadFile())
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{
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Debug.LogError("Failed to read file, attempting to regenerate audio geometry");
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// We should not try to upload data dynamically if data already exists
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UploadGeometry();
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}
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}
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else
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{
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UploadGeometry();
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}
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}
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/// <summary>
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/// Update the world transform (TODO)
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/// </summary>
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private void Update()
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{
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if (geometryHandle == IntPtr.Zero)
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return;
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Matrix4x4 m = transform.localToWorldMatrix;
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// Note: flip Z to convert from left-handed (+Z forward) to right-handed (+Z backward)
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float[] matrix = { m[0,0], m[1,0], -m[2,0], m[3,0],
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m[0,1], m[1,1], -m[2,1], m[3,1],
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m[0,2], m[1,2], -m[2,2], m[3,2],
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m[0,3], m[1,3], -m[2,3], m[3,3] };
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ONSPPropagation.Interface.AudioGeometrySetTransform(geometryHandle, matrix);
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}
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/// <summary>
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/// Call when destroyed
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/// </summary>
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private void OnDestroy()
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{
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// DESTROY GEOMETRY
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if (geometryHandle != IntPtr.Zero && ONSPPropagation.Interface.DestroyAudioGeometry(geometryHandle) != OSPSuccess)
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{
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throw new Exception("Unable to destroy geometry");
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}
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geometryHandle = IntPtr.Zero;
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}
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//
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// FUNCTIONS FOR UPLOADING MESHES VIA GAME OBJECT
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//
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static int terrainDecimation = 4;
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private struct MeshMaterial
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{
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public MeshFilter meshFilter;
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public ONSPPropagationMaterial[] materials;
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}
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private struct TerrainMaterial
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{
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public Terrain terrain;
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public ONSPPropagationMaterial[] materials;
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public Mesh[] treePrototypeMeshes;
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}
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private static void traverseMeshHierarchy(GameObject obj, ONSPPropagationMaterial[] currentMaterials, bool includeChildren,
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List<MeshMaterial> meshMaterials, List<TerrainMaterial> terrainMaterials, bool ignoreStatic, ref int ignoredMeshCount)
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{
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if (!obj.activeInHierarchy)
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return;
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MeshFilter[] meshes = obj.GetComponents<MeshFilter>();
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Terrain[] terrains = obj.GetComponents<Terrain>();
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ONSPPropagationMaterial[] materials = obj.GetComponents<ONSPPropagationMaterial>();
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// Initialize the current material array to a new array if there are any new materials.
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if (materials != null && materials.Length > 0)
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{
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// Determine the length of the material array.
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int maxLength = materials.Length;
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if (currentMaterials != null)
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maxLength = Math.Max(maxLength, currentMaterials.Length);
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ONSPPropagationMaterial[] newMaterials = new ONSPPropagationMaterial[maxLength];
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// Copy the previous materials into the new array.
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if (currentMaterials != null)
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{
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for (int i = materials.Length; i < maxLength; i++)
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newMaterials[i] = currentMaterials[i];
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}
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currentMaterials = newMaterials;
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// Copy the current materials.
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for (int i = 0; i < materials.Length; i++)
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currentMaterials[i] = materials[i];
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}
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// Gather the meshes.
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foreach (MeshFilter meshFilter in meshes)
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{
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Mesh mesh = meshFilter.sharedMesh;
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if (mesh == null)
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continue;
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if (ignoreStatic && !mesh.isReadable)
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{
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Debug.LogWarning("Mesh: " + meshFilter.gameObject.name + " not readable, cannot be static.", meshFilter.gameObject);
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++ignoredMeshCount;
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continue;
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}
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MeshMaterial m = new MeshMaterial();
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m.meshFilter = meshFilter;
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m.materials = currentMaterials;
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meshMaterials.Add(m);
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}
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// Gather the terrains.
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foreach (Terrain terrain in terrains)
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{
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TerrainMaterial m = new TerrainMaterial();
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m.terrain = terrain;
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m.materials = currentMaterials;
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terrainMaterials.Add(m);
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}
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// Traverse to the child objects.
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if (includeChildren)
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{
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foreach (Transform child in obj.transform)
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{
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if (child.GetComponent<ONSPPropagationGeometry>() == null) // skip children which have their own component
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traverseMeshHierarchy(child.gameObject, currentMaterials, includeChildren, meshMaterials, terrainMaterials, ignoreStatic, ref ignoredMeshCount);
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}
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}
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}
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//
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// CALL THIS ON GAME OBJECT THAT HAS GEOMETRY ATTACHED TO IT
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//
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private int uploadMesh(IntPtr geometryHandle, GameObject meshObject, Matrix4x4 worldToLocal)
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{
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int unused = 0;
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return uploadMesh(geometryHandle, meshObject, worldToLocal, false, ref unused);
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}
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private int uploadMesh(IntPtr geometryHandle, GameObject meshObject, Matrix4x4 worldToLocal, bool ignoreStatic, ref int ignoredMeshCount)
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{
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// Get the child mesh objects.
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List<MeshMaterial> meshes = new List<MeshMaterial>();
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List<TerrainMaterial> terrains = new List<TerrainMaterial>();
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traverseMeshHierarchy(meshObject, null, includeChildMeshes, meshes, terrains, ignoreStatic, ref ignoredMeshCount);
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//***********************************************************************
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// Count the number of vertices and indices.
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int totalVertexCount = 0;
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uint totalIndexCount = 0;
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int totalFaceCount = 0;
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int totalMaterialCount = 0;
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foreach (MeshMaterial m in meshes)
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{
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updateCountsForMesh(ref totalVertexCount, ref totalIndexCount, ref totalFaceCount, ref totalMaterialCount, m.meshFilter.sharedMesh);
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}
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// TODO: expose tree material
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ONSPPropagationMaterial[] treeMaterials = new ONSPPropagationMaterial[1];
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for (int i = 0; i < terrains.Count; ++i)
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{
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TerrainMaterial t = terrains[i];
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TerrainData terrain = t.terrain.terrainData;
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#if UNITY_2019_3_OR_NEWER
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int w = terrain.heightmapResolution;
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int h = terrain.heightmapResolution;
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#else
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int w = terrain.heightmapWidth;
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int h = terrain.heightmapHeight;
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#endif
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int wRes = (w - 1) / terrainDecimation + 1;
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int hRes = (h - 1) / terrainDecimation + 1;
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int vertexCount = wRes * hRes;
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int indexCount = (wRes - 1) * (hRes - 1) * 6;
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totalMaterialCount++;
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totalVertexCount += vertexCount;
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totalIndexCount += (uint)indexCount;
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totalFaceCount += indexCount / 3;
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#if INCLUDE_TERRAIN_TREES
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TreePrototype[] treePrototypes = terrain.treePrototypes;
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if (treePrototypes.Length != 0)
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{
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if (treeMaterials[0] == null)
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{
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// Create the tree material
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treeMaterials[0] = gameObject.AddComponent<ONSPPropagationMaterial>();
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#if true
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treeMaterials[0].SetPreset(ONSPPropagationMaterial.Preset.Foliage);
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#else
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// Custom material that is highly transmissive
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treeMaterials[0].absorption.points = new List<ONSPPropagationMaterial.Point>{
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new ONSPPropagationMaterial.Point(125f, .03f),
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new ONSPPropagationMaterial.Point(250f, .06f),
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new ONSPPropagationMaterial.Point(500f, .11f),
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new ONSPPropagationMaterial.Point(1000f, .17f),
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new ONSPPropagationMaterial.Point(2000f, .27f),
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new ONSPPropagationMaterial.Point(4000f, .31f) };
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treeMaterials[0].scattering.points = new List<ONSPPropagationMaterial.Point>{
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new ONSPPropagationMaterial.Point(125f, .20f),
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new ONSPPropagationMaterial.Point(250f, .3f),
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new ONSPPropagationMaterial.Point(500f, .4f),
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new ONSPPropagationMaterial.Point(1000f, .5f),
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new ONSPPropagationMaterial.Point(2000f, .7f),
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new ONSPPropagationMaterial.Point(4000f, .8f) };
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treeMaterials[0].transmission.points = new List<ONSPPropagationMaterial.Point>(){
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new ONSPPropagationMaterial.Point(125f, .95f),
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new ONSPPropagationMaterial.Point(250f, .92f),
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new ONSPPropagationMaterial.Point(500f, .87f),
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new ONSPPropagationMaterial.Point(1000f, .81f),
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new ONSPPropagationMaterial.Point(2000f, .71f),
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new ONSPPropagationMaterial.Point(4000f, .67f) };
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#endif
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}
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t.treePrototypeMeshes = new Mesh[treePrototypes.Length];
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// assume the sharedMesh with the lowest vertex is the lowest LOD
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for (int j = 0; j < treePrototypes.Length; ++j)
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{
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GameObject prefab = treePrototypes[j].prefab;
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MeshFilter[] meshFilters = prefab.GetComponentsInChildren<MeshFilter>();
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int minVertexCount = int.MaxValue;
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int index = -1;
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for (int k = 0; k < meshFilters.Length; ++k)
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{
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int count = meshFilters[k].sharedMesh.vertexCount;
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if (count < minVertexCount)
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{
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minVertexCount = count;
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index = k;
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}
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}
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t.treePrototypeMeshes[j] = meshFilters[index].sharedMesh;
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}
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TreeInstance[] trees = terrain.treeInstances;
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foreach (TreeInstance tree in trees)
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{
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updateCountsForMesh(ref totalVertexCount, ref totalIndexCount, ref totalFaceCount,
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ref totalMaterialCount, t.treePrototypeMeshes[tree.prototypeIndex]);
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}
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terrains[i] = t;
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}
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#endif
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}
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//***********************************************************************
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// Copy the mesh data.
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List<Vector3> tempVertices = new List<Vector3>();
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List<int> tempIndices = new List<int>();
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MeshGroup[] groups = new MeshGroup[totalMaterialCount];
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float[] vertices = new float[totalVertexCount * 3];
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int[] indices = new int[totalIndexCount];
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int vertexOffset = 0;
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int indexOffset = 0;
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int groupOffset = 0;
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foreach (MeshMaterial m in meshes)
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{
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MeshFilter meshFilter = m.meshFilter;
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// Compute the combined transform to go from mesh-local to geometry-local space.
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Matrix4x4 matrix = worldToLocal * meshFilter.gameObject.transform.localToWorldMatrix;
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uploadMeshFilter(tempVertices, tempIndices, groups, vertices, indices, ref vertexOffset, ref indexOffset, ref groupOffset, meshFilter.sharedMesh, m.materials, matrix);
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}
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foreach (TerrainMaterial t in terrains)
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{
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TerrainData terrain = t.terrain.terrainData;
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// Compute the combined transform to go from mesh-local to geometry-local space.
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Matrix4x4 matrix = worldToLocal * t.terrain.gameObject.transform.localToWorldMatrix;
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#if UNITY_2019_3_OR_NEWER
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int w = terrain.heightmapResolution;
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int h = terrain.heightmapResolution;
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#else
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int w = terrain.heightmapWidth;
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int h = terrain.heightmapHeight;
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#endif
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float[,] tData = terrain.GetHeights(0, 0, w, h);
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Vector3 meshScale = terrain.size;
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meshScale = new Vector3(meshScale.x / (w - 1) * terrainDecimation, meshScale.y, meshScale.z / (h - 1) * terrainDecimation);
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int wRes = (w - 1) / terrainDecimation + 1;
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int hRes = (h - 1) / terrainDecimation + 1;
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int vertexCount = wRes * hRes;
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int triangleCount = (wRes - 1) * (hRes - 1) * 2;
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// Initialize the group.
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groups[groupOffset].faceType = FaceType.TRIANGLES;
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groups[groupOffset].faceCount = (UIntPtr)triangleCount;
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groups[groupOffset].indexOffset = (UIntPtr)indexOffset;
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if (t.materials != null && 0 < t.materials.Length)
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{
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t.materials[0].StartInternal();
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groups[groupOffset].material = t.materials[0].materialHandle;
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}
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else
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groups[groupOffset].material = IntPtr.Zero;
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// Build vertices and UVs
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for (int y = 0; y < hRes; y++)
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{
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for (int x = 0; x < wRes; x++)
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{
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int offset = (vertexOffset + y * wRes + x) * 3;
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Vector3 v = matrix.MultiplyPoint3x4(Vector3.Scale(meshScale, new Vector3(y, tData[x * terrainDecimation, y * terrainDecimation], x)));
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vertices[offset + 0] = v.x;
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vertices[offset + 1] = v.y;
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vertices[offset + 2] = v.z;
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}
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}
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// Build triangle indices: 3 indices into vertex array for each triangle
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for (int y = 0; y < hRes - 1; y++)
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{
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for (int x = 0; x < wRes - 1; x++)
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{
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// For each grid cell output two triangles
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indices[indexOffset + 0] = (vertexOffset + (y * wRes) + x);
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indices[indexOffset + 1] = (vertexOffset + ((y + 1) * wRes) + x);
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indices[indexOffset + 2] = (vertexOffset + (y * wRes) + x + 1);
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indices[indexOffset + 3] = (vertexOffset + ((y + 1) * wRes) + x);
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indices[indexOffset + 4] = (vertexOffset + ((y + 1) * wRes) + x + 1);
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indices[indexOffset + 5] = (vertexOffset + (y * wRes) + x + 1);
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indexOffset += 6;
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}
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}
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vertexOffset += vertexCount;
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groupOffset++;
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#if INCLUDE_TERRAIN_TREES
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TreeInstance[] trees = terrain.treeInstances;
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foreach (TreeInstance tree in trees)
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{
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Vector3 pos = Vector3.Scale(tree.position, terrain.size);
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Matrix4x4 treeLocalToWorldMatrix = t.terrain.gameObject.transform.localToWorldMatrix;
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treeLocalToWorldMatrix.SetColumn(3, treeLocalToWorldMatrix.GetColumn(3) + new Vector4(pos.x, pos.y, pos.z, 0.0f));
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// TODO: tree rotation
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Matrix4x4 treeMatrix = worldToLocal * treeLocalToWorldMatrix;
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uploadMeshFilter(tempVertices, tempIndices, groups, vertices, indices, ref vertexOffset, ref indexOffset, ref groupOffset, t.treePrototypeMeshes[tree.prototypeIndex], treeMaterials, treeMatrix);
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}
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#endif
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}
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// Upload mesh data
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return ONSPPropagation.Interface.AudioGeometryUploadMeshArrays(geometryHandle,
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vertices, totalVertexCount,
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indices, indices.Length,
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groups, groups.Length);
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}
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private static void uploadMeshFilter(List<Vector3> tempVertices, List<int> tempIndices, MeshGroup[] groups, float[] vertices, int[] indices,
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ref int vertexOffset, ref int indexOffset, ref int groupOffset, Mesh mesh, ONSPPropagationMaterial[] materials, Matrix4x4 matrix)
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{
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// Get the mesh vertices.
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tempVertices.Clear();
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mesh.GetVertices(tempVertices);
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// Copy the Vector3 vertices into a packed array of floats for the API.
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int meshVertexCount = tempVertices.Count;
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for (int i = 0; i < meshVertexCount; i++)
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{
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// Transform into the parent space.
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Vector3 v = matrix.MultiplyPoint3x4(tempVertices[i]);
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int offset = (vertexOffset + i) * 3;
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vertices[offset + 0] = v.x;
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vertices[offset + 1] = v.y;
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vertices[offset + 2] = v.z;
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}
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// Copy the data for each submesh.
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for (int i = 0; i < mesh.subMeshCount; i++)
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{
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MeshTopology topology = mesh.GetTopology(i);
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if (topology == MeshTopology.Triangles || topology == MeshTopology.Quads)
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{
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// Get the submesh indices.
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tempIndices.Clear();
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mesh.GetIndices(tempIndices, i);
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int subMeshIndexCount = tempIndices.Count;
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// Copy and adjust the indices.
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for (int j = 0; j < subMeshIndexCount; j++)
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indices[indexOffset + j] = tempIndices[j] + vertexOffset;
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// Initialize the group.
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if (topology == MeshTopology.Triangles)
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{
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groups[groupOffset + i].faceType = FaceType.TRIANGLES;
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groups[groupOffset + i].faceCount = (UIntPtr)(subMeshIndexCount / 3);
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}
|
|
else if (topology == MeshTopology.Quads)
|
|
{
|
|
groups[groupOffset + i].faceType = FaceType.QUADS;
|
|
groups[groupOffset + i].faceCount = (UIntPtr)(subMeshIndexCount / 4);
|
|
}
|
|
|
|
groups[groupOffset + i].indexOffset = (UIntPtr)indexOffset;
|
|
|
|
if (materials != null && materials.Length != 0)
|
|
{
|
|
int matIndex = i;
|
|
if (matIndex >= materials.Length)
|
|
matIndex = materials.Length - 1;
|
|
materials[matIndex].StartInternal();
|
|
groups[groupOffset + i].material = materials[matIndex].materialHandle;
|
|
}
|
|
else
|
|
groups[groupOffset + i].material = IntPtr.Zero;
|
|
|
|
indexOffset += subMeshIndexCount;
|
|
}
|
|
}
|
|
|
|
vertexOffset += meshVertexCount;
|
|
groupOffset += mesh.subMeshCount;
|
|
}
|
|
|
|
private static void updateCountsForMesh(ref int totalVertexCount, ref uint totalIndexCount, ref int totalFaceCount, ref int totalMaterialCount, Mesh mesh)
|
|
{
|
|
totalMaterialCount += mesh.subMeshCount;
|
|
totalVertexCount += mesh.vertexCount;
|
|
|
|
for (int i = 0; i < mesh.subMeshCount; i++)
|
|
{
|
|
MeshTopology topology = mesh.GetTopology(i);
|
|
if (topology == MeshTopology.Triangles || topology == MeshTopology.Quads)
|
|
{
|
|
uint meshIndexCount = mesh.GetIndexCount(i);
|
|
totalIndexCount += meshIndexCount;
|
|
|
|
if (topology == MeshTopology.Triangles)
|
|
totalFaceCount += (int)meshIndexCount / 3;
|
|
else if (topology == MeshTopology.Quads)
|
|
totalFaceCount += (int)meshIndexCount / 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
//***********************************************************************
|
|
// UploadGeometry
|
|
|
|
public void UploadGeometry()
|
|
{
|
|
int ignoredMeshCount = 0;
|
|
if (uploadMesh(geometryHandle, gameObject, gameObject.transform.worldToLocalMatrix, true, ref ignoredMeshCount) != OSPSuccess)
|
|
throw new Exception("Unable to upload audio mesh geometry");
|
|
|
|
if (ignoredMeshCount != 0)
|
|
{
|
|
Debug.LogError("Failed to upload meshes, " + ignoredMeshCount + " static meshes ignored. Turn on \"File Enabled\" to process static meshes offline", gameObject);
|
|
}
|
|
}
|
|
|
|
#if UNITY_EDITOR
|
|
//***********************************************************************
|
|
// WriteFile - Write the serialized mesh file.
|
|
|
|
public bool WriteFile()
|
|
{
|
|
if (filePathRelative == "")
|
|
{
|
|
filePathRelative = GetPath(transform);
|
|
string modifier = "";
|
|
int counter = 0;
|
|
while (System.IO.File.Exists(filePath + modifier))
|
|
{
|
|
modifier = "-" + counter;
|
|
++counter;
|
|
|
|
if (counter > 10000)
|
|
{
|
|
// sanity check to prevent hang
|
|
throw new Exception("Unable to find sutiable file name");
|
|
}
|
|
}
|
|
|
|
filePathRelative = filePathRelative + modifier;
|
|
Debug.Log("No file path specified, autogenerated: " + filePathRelative);
|
|
}
|
|
|
|
// Create the directory
|
|
string directoryName = filePathRelative.Substring(0, filePathRelative.LastIndexOf('/'));
|
|
System.IO.Directory.CreateDirectory(GeometryAssetPath + "/" + directoryName);
|
|
|
|
// Create a temporary geometry.
|
|
IntPtr tempGeometryHandle = IntPtr.Zero;
|
|
if (ONSPPropagation.Interface.CreateAudioGeometry(out tempGeometryHandle) != OSPSuccess)
|
|
{
|
|
throw new Exception("Failed to create temp geometry handle");
|
|
}
|
|
|
|
// Upload the mesh geometry.
|
|
if (uploadMesh(tempGeometryHandle, gameObject, gameObject.transform.worldToLocalMatrix) != OSPSuccess)
|
|
{
|
|
Debug.LogError("Error uploading mesh " + gameObject.name);
|
|
return false;
|
|
}
|
|
|
|
// Write the mesh to a file.
|
|
if (ONSPPropagation.Interface.AudioGeometryWriteMeshFile(tempGeometryHandle, filePath) != OSPSuccess)
|
|
{
|
|
Debug.LogError("Error writing mesh file " + filePath);
|
|
return false;
|
|
}
|
|
|
|
// Destroy the geometry.
|
|
if (ONSPPropagation.Interface.DestroyAudioGeometry(tempGeometryHandle) != OSPSuccess)
|
|
{
|
|
throw new Exception("Failed to destroy temp geometry handle");
|
|
}
|
|
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
//***********************************************************************
|
|
// ReadFile - Read the serialized mesh file.
|
|
|
|
public bool ReadFile()
|
|
{
|
|
if (filePath == null || filePath.Length == 0)
|
|
{
|
|
Debug.LogError("Invalid mesh file path");
|
|
return false;
|
|
}
|
|
|
|
if (ONSPPropagation.Interface.AudioGeometryReadMeshFile(geometryHandle, filePath) != OSPSuccess)
|
|
{
|
|
Debug.LogError("Error reading mesh file " + filePath);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
public bool WriteToObj()
|
|
{
|
|
// Create a temporary geometry.
|
|
IntPtr tempGeometryHandle = IntPtr.Zero;
|
|
if (ONSPPropagation.Interface.CreateAudioGeometry(out tempGeometryHandle) != OSPSuccess)
|
|
{
|
|
throw new Exception("Failed to create temp geometry handle");
|
|
}
|
|
|
|
// Upload the mesh geometry.
|
|
if (uploadMesh(tempGeometryHandle, gameObject, gameObject.transform.worldToLocalMatrix) != OSPSuccess)
|
|
{
|
|
Debug.LogError("Error uploading mesh " + gameObject.name);
|
|
return false;
|
|
}
|
|
|
|
// Write the mesh to a .obj file.
|
|
if (ONSPPropagation.Interface.AudioGeometryWriteMeshFileObj(tempGeometryHandle, filePath + ".obj") != OSPSuccess)
|
|
{
|
|
Debug.LogError("Error writing .obj file " + filePath + ".obj");
|
|
return false;
|
|
}
|
|
|
|
// Destroy the geometry.
|
|
if (ONSPPropagation.Interface.DestroyAudioGeometry(tempGeometryHandle) != OSPSuccess)
|
|
{
|
|
throw new Exception("Failed to destroy temp geometry handle");
|
|
}
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|