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using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
namespace NGS.MeshFusionPro;
public class MeshCutterSimpleSTD : IMeshCutter
{
private static List<Vector3> _vertices;
private static List<Vector3> _normals;
private static List<Vector4> _tangents;
private static List<int> _triangles;
private static List<Vector2>[] _uvs;
private static int _maxUVsCount;
static MeshCutterSimpleSTD()
{
_maxUVsCount = 4;
_vertices = new List<Vector3>();
_normals = new List<Vector3>();
_tangents = new List<Vector4>();
_triangles = new List<int>();
_uvs = new List<Vector2>[_maxUVsCount];
for (int i = 0; i < _maxUVsCount; i++)
{
_uvs[i] = new List<Vector2>();
}
}
public void Cut(Mesh mesh, MeshCuttingInfo info)
{
Cut(mesh, new MeshCuttingInfo[1] { info });
}
public void Cut(Mesh mesh, IList<MeshCuttingInfo> infos)
{
ValidateMeshOrThrowException(mesh);
CollectData(mesh);
foreach (MeshCuttingInfo item in infos.OrderByDescending((MeshCuttingInfo i) => i.triangleStart))
{
RemoveData(item);
OffsetTriangles(item);
}
ApplyDataToMesh(mesh);
ClearData();
}
private void ValidateMeshOrThrowException(Mesh mesh)
{
if (mesh == null)
{
throw new ArgumentNullException("mesh is null");
}
if (mesh.subMeshCount > 1)
{
throw new ArgumentException("SimpleMeshCutter::'mesh' should has only 1 submesh");
}
}
private void CollectData(Mesh mesh)
{
mesh.GetVertices(_vertices);
mesh.GetNormals(_normals);
mesh.GetTangents(_tangents);
mesh.GetTriangles(_triangles, 0);
for (int i = 0; i < _maxUVsCount; i++)
{
mesh.GetUVs(i, _uvs[i]);
}
}
private void RemoveData(MeshCuttingInfo cuttingInfo)
{
int vertexStart = cuttingInfo.vertexStart;
int vertexCount = cuttingInfo.vertexCount;
_vertices.RemoveRange(vertexStart, vertexCount);
if (_normals.Count > 0)
{
_normals.RemoveRange(vertexStart, vertexCount);
}
if (_tangents.Count > 0)
{
_tangents.RemoveRange(vertexStart, vertexCount);
}
_triangles.RemoveRange(cuttingInfo.triangleStart, cuttingInfo.triangleCount);
for (int i = 0; i < _uvs.Length; i++)
{
if (_uvs[i].Count > 0)
{
_uvs[i].RemoveRange(vertexStart, vertexCount);
}
}
}
private void OffsetTriangles(MeshCuttingInfo info)
{
int vertexCount = info.vertexCount;
int triangleStart = info.triangleStart;
int count = _triangles.Count;
for (int i = triangleStart; i < count; i++)
{
_triangles[i] -= vertexCount;
}
}
private void ApplyDataToMesh(Mesh mesh)
{
mesh.SetTriangles(_triangles, 0);
mesh.SetVertices(_vertices);
mesh.SetNormals(_normals);
mesh.SetTangents(_tangents);
for (int i = 0; i < _maxUVsCount; i++)
{
if (_uvs[i].Count > 0)
{
mesh.SetUVs(i, _uvs[i]);
}
}
}
private void ClearData()
{
_vertices.Clear();
_normals.Clear();
_tangents.Clear();
_triangles.Clear();
for (int i = 0; i < _maxUVsCount; i++)
{
_uvs[i].Clear();
}
}
}
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