private void UpdateTriangles()//根据倍数重新计算三角面片
{
var mesh = GetComponent <SkinnedMeshRenderer>().sharedMesh;
var vertices = mesh.vertices;
if (triangleMultiNum == 1)//1倍直接把原来存好的三角形给它
{
MeshACopyToMeshB(oldMesh, mesh);
return;
}
var verticesList = new List <Vector3>();
var normalsList = new List <Vector3>();
var uvList = new List <Vector2>();
int triangleNum = (int)(oldMesh.triangles.Length * triangleMultiNum);
triangleNum += 3 - triangleNum % 3;
Debug.Log("triangleNum: " + triangleNum);
//var triangles = new int[triangleNum];
var trianglesList = new List <int>();
foreach (var item in oldMesh.vertices)
{
verticesList.Add(item);
}
foreach (var item in oldMesh.normals)
{
normalsList.Add(item);
}
foreach (var item in oldMesh.uv)
{
uvList.Add(item);
}
var sd = new SortedDictionary <Cost, int[]>(new CostComparer());
int id = 0;//新加入sd的cost的id
for (int i = 0; i < oldMesh.triangles.Length; i += 3)
{
int[] outTriangle;
int[] triangle = new int[] { oldMesh.triangles[i], oldMesh.triangles[i + 1], oldMesh.triangles[i + 2] };
float len = DivideTriangle(triangle, out outTriangle, verticesList);
sd.Add(new Cost(len, ++id), triangle);
}
while (sd.Count * 3 < triangleNum)
{
var e = sd.GetEnumerator();
e.MoveNext();
var ec = e.Current;
int[] triangle = ec.Value; //取最长边最长的三角形进行划分
sd.Remove(ec.Key); //从sd中删掉该三角形
int[] outTriangle;
DivideTriangle(triangle, out outTriangle, verticesList);
int tot = verticesList.Count; //新加的点的index
verticesList.Add((verticesList[outTriangle[0]] + verticesList[outTriangle[1]]) / 2); //加入最长边中点
var normal = new Vector3(0, 0, 0);
var uv = new Vector2(0, 0);
foreach (var i in triangle)
{
if (haveNormals)
{
normal += normalsList[i];
}
if (haveUv)
{
uv += uvList[i];
}
}
normal /= triangle.Length;
uv /= triangle.Length;
if (haveNormals)
{
normalsList.Add(normal);
}
if (haveUv)
{
uvList.Add(uv);
}
var t1 = new int[] { outTriangle[0], tot, outTriangle[2] };
var t2 = new int[] { outTriangle[1], outTriangle[2], tot };
var len = DivideTriangle(t1, out outTriangle, verticesList);
sd.Add(new Cost(len, ++id), t1);
len = DivideTriangle(t2, out outTriangle, verticesList);
sd.Add(new Cost(len, ++id), t2);
}
int cc = 0;
var enumerator = sd.GetEnumerator();
for (int i = 0; enumerator.MoveNext(); i++)
{
//Debug.Log("length: "+enumerator.Current.Key.cost);
int[] triangle = enumerator.Current.Value;
for (int j = 0; j < 3; j++)
{
//triangles[i * 3 + j] = triangle[j];
trianglesList.Add(triangle[j]);
cc++;
}
}
mesh.Clear();
mesh.vertices = verticesList.ToArray();
if (haveNormals)
{
mesh.normals = normalsList.ToArray();
}
if (haveUv)
{
mesh.uv = uvList.ToArray();
}
mesh.triangles = trianglesList.ToArray();
panelStatusController.UpdateTextTriangleNum();
}
