void Start()
{
WallManager.Instance.Register(this);
var localToWorld = transform.localToWorldMatrix;
var mesh = GetComponent <MeshFilter>().mesh;
Vector3[] vertices = mesh.vertices;
var triangles = mesh.triangles;
//找到贴紧地面的那些三角形
for (int i = 0; i < triangles.Length; i += 3)
{
var v0 = localToWorld.MultiplyPoint(vertices[triangles[i]]);
var v1 = localToWorld.MultiplyPoint(vertices[triangles[i + 1]]);
var v2 = localToWorld.MultiplyPoint(vertices[triangles[i + 2]]);
if (Mathf.Abs(v0.y) < k_epsilon && Mathf.Abs(v1.y) < k_epsilon && Mathf.Abs(v2.y) < k_epsilon)
{
var list = new List <IntPoint>();
m_polygons.Add(list);
list.Add(ClipperUtils.Convert(v0));
list.Add(ClipperUtils.Convert(v1));
list.Add(ClipperUtils.Convert(v2));
}
}
//去掉重复的顶点
m_polygons = Clipper.SimplifyPolygons(m_polygons);
}
/// <summary>
/// 生成轮廓线
/// </summary>
private void MakeContourLine(List <IntPoint> polygon, Vector2 hitPos)
{
//调整起点
var list = ClipperUtils.Convert(polygon, k_altitude);
Vector2 minIntersect;
int minIndex;
FindStartPos(list, hitPos, out minIndex, out minIntersect);
m_contour = new Vector3[list.Length + 2];
int index = 0;
m_contour[index++] = new Vector3(minIntersect.x, k_altitude, minIntersect.y);
for (int i = minIndex; i < list.Length; i++)
{
m_contour[index++] = list[i];
}
for (int i = 0; i < minIndex; i++)
{
m_contour[index++] = list[i];
}
m_contour[index++] = m_contour[0]; //首尾相连
//设置LineRenderer
var line = Instantiate(m_contourLine);
line.transform.SetParent(transform);
line.transform.position = Vector3.zero;
line.positionCount = m_contour.Length;
line.SetPositions(m_contour);
}