public GameObject CreateObject(CutVictim original)
{
var obj = new GameObject("cut obj", typeof(CutVictim), typeof(Rigidbody2D));
var mesh = new Mesh {
vertices = Positions.ToArray(),
triangles = Triangles.ToArray()
};
mesh.RecalculateNormals();
obj.GetComponent <MeshFilter>().mesh = mesh;
obj.GetComponent <MeshRenderer>().material = original.Material;
var collider = obj.GetComponent <PolygonCollider2D>();
collider.points = original.Collider.points;
var rigidBody = obj.GetComponent <Rigidbody2D>();
var force = new Vector2(Random.Range(-5, 5), Random.Range(-5, 5));
rigidBody.AddForce(force, ForceMode2D.Impulse);
return(obj);
}
private Vector3 pos2; // planeとmeshの交点その2
public void Cut(Plane plane, CutVictim victim)
{
var group1 = new CutGroup();
var group2 = new CutGroup();
for (var i = 0; i < victim.Triangles.Length; i += 3)
{
var positions1 = new List <Vector3>();
var positions2 = new List <Vector3>();
var idx0 = victim.Triangles[i];
var idx1 = victim.Triangles[i + 1];
var idx2 = victim.Triangles[i + 2];
var vertices = new List <Vector3>();
var v1 = Vector3.Scale(victim.Vertices[idx0], victim.Scale) + victim.Position;
vertices.Add(v1);
var v2 = Vector3.Scale(victim.Vertices[idx1], victim.Scale) + victim.Position;
vertices.Add(v2);
var v3 = Vector3.Scale(victim.Vertices[idx2], victim.Scale) + victim.Position;
vertices.Add(v3);
// そのポリゴンの法線を計算しておく
var normal = Vector3.Cross(victim.Vertices[idx2] - victim.Vertices[idx0], victim.Vertices[idx1] - victim.Vertices[idx0]);
AllocateVertices(plane, vertices, positions1, positions2); // 1.グループ分け
// どちらにもカウントがあるということはplateと交差しているポリゴンということ
if (positions1.Count > 0 && positions2.Count > 0)
{
CalcCrossPoint(plane, positions1, positions2); // 2.planeとの交点を求める
// 3.両方のグループともに交点を入れる
positions1.Add(pos1);
positions1.Add(pos2);
group1.CapPositions.Add(pos1);
group1.CapPositions.Add(pos2);
positions2.Add(pos1);
positions2.Add(pos2);
group2.CapPositions.Add(pos1);
group2.CapPositions.Add(pos2);
}
if (positions1.Count > 0)
{
var triangles = CreateTriangles(positions1, normal);
var count = group1.Positions.Count;
group1.Positions.AddRange(positions1);
// 二つめ以降ならidxがずれることに注意
foreach (var idx in triangles)
{
group1.Triangles.Add(idx + count);
}
}
if (positions2.Count > 0)
{
var triangles = CreateTriangles(positions2, normal);
var count = group2.Positions.Count;
group2.Positions.AddRange(positions2);
// 二つめ以降ならidxがずれることに注意
foreach (var idx in triangles)
{
group2.Triangles.Add(idx + count);
}
}
}
// 蓋を作る
group1.Capping(plane, true);
group2.Capping(plane, true);
// 4.2つのグループに分けたオブジェクトを作成する
group1.CreateObject(victim);
group2.CreateObject(victim);
// 5.元オブジェクトを消去する
Object.Destroy(victim.gameObject);
}
