/// <summary>
/// 获取面列表.
/// </summary>
/// <param name="chars">Chars.</param>
private void GetTriangleList(string[] chars)
{
var indexVectorList = new List <ObjVector3>();
var triangleList = new List <ObjVector3>();
for (int i = 1; i < chars.Length; ++i)
{
//将每一行按照空格分割后从第一个元素开始
//按照/继续分割可依次获得顶点索引、法线索引和UV索引
var indexs = chars[i].Split('/');
var indexVector = new ObjVector3(0, 0, 0);
//顶点索引
indexVector.x = ConvertToInt(indexs[0]);
//法线索引
if (indexs.Length > 1)
{
if (indexs[1] != "")
{
indexVector.y = ConvertToInt(indexs[1]);
}
}
//UV索引
if (indexs.Length > 2)
{
if (indexs[2] != "")
{
indexVector.z = ConvertToInt(indexs[2]);
}
}
//将索引向量加入列表中
indexVectorList.Add(indexVector);
}
//这里需要研究研究
for (int j = 1; j < indexVectorList.Count - 1; ++j)
{
//按照0,1,2这样的方式来组成面
triangleList.Add(indexVectorList[0]);
triangleList.Add(indexVectorList[j]);
triangleList.Add(indexVectorList[j + 1]);
}
//添加到索引列表
foreach (ObjVector3 item in triangleList)
{
faceVertexNormalUV.Add(item);
}
}
/// <summary>
/// 合并三角面
/// </summary>
private void Combine()
{
//使用一个字典来存储要合并的索引信息
Dictionary <int, ArrayList> toCambineList = new Dictionary <int, ArrayList>();
for (int i = 0; i < faceVertexNormalUV.Count; i++)
{
if (faceVertexNormalUV[i] != ObjVector3.zero)
{
//相同索引的列表
ArrayList SameIndexList = new ArrayList();
SameIndexList.Add(i);
for (int j = 0; j < faceVertexNormalUV.Count; j++)
{
if (faceVertexNormalUV[j] != ObjVector3.zero)
{
if (i != j)
{
//如果顶点索引和法线索引相同，说明它们在一个面上
ObjVector3 iTemp = (ObjVector3)faceVertexNormalUV[i];
ObjVector3 jTemp = (ObjVector3)faceVertexNormalUV[j];
if (iTemp.x == jTemp.x && iTemp.y == jTemp.y)
{
//将索引相同索引列表然后将其重置为零向量
//PS:这是个危险的地方，如果某个索引信息为Vector3.Zero
//就会被忽略过去，可是貌似到目前为止没有发现为Vector3.Zero的情况
SameIndexList.Add(j);
faceVertexNormalUV[j] = ObjVector3.zero;
}
}
}
}
//用一个索引来作为字典的键名，这样它可以代替对应列表内所有索引
toCambineList.Add(i, SameIndexList);
}
}
//初始化各个数组
this.VertexArray = new ObjVector3[toCambineList.Count];
this.UVArray = new ObjVector2[toCambineList.Count];
this.NormalArray = new ObjVector3[toCambineList.Count];
this.TriangleArray = new int[faceVertexNormalUV.Count];
//定义遍历字典的计数器
int count = 0;
//遍历词典
foreach (KeyValuePair <int, ArrayList> IndexTtem in toCambineList)
{
//根据索引给面数组赋值
foreach (int item in IndexTtem.Value)
{
TriangleArray[item] = count;
}
//当前的顶点、UV、法线索引信息
ObjVector3 VectorTemp = (ObjVector3)faceVertexNormalUV[IndexTtem.Key];
//给顶点数组赋值
VertexArray[count] = (ObjVector3)vertexArrayList[(int)VectorTemp.x - 1];
//给UV数组赋值
if (uvArrayList.Count > 0)
{
ObjVector3 tVec = (ObjVector3)uvArrayList[(int)VectorTemp.y - 1];
UVArray[count] = new ObjVector2(tVec.x, tVec.y);
}
//给法线数组赋值
if (normalArrayList.Count > 0)
{
NormalArray[count] = (ObjVector3)normalArrayList[(int)VectorTemp.z - 1];
}
count++;
}
}
