//屏幕拾取点与模型中面的映射，即拾取点属于哪个面的判断，并返回该面中心点
public static Vertex3 PointinWhichTri(Vertex3 ObP, t3DModel model)
{
Vertex3 Center = new Vertex3(0, 0, 0);
int t = 0;
for (int i = 0; i < model.numOfObjects; i++)
{
t3DObject pObject = model.pObject[i]; //模型中的体
for (int j = 0; j < pObject.numOfFaces; j++) //体的面
{
Vertex3[] p = new Vertex3[3];
for (int k = 0; k < 3; k++)
{
int index = pObject.pFaces[j].vertIndex[k];
Vertex3 pi = new Vertex3(pObject.pVerts[index].x, pObject.pVerts[index].y, pObject.pVerts[index].z);//每一个三角面顶点坐标
p[k] = pi;
}
Triangle Tri = new Triangle(p[0], p[1], p[2]);
if (PointinTriangle(Tri.p1, Tri.p2, Tri.p3, ObP))
{
Center = CenterP(Tri.p1, Tri.p2, Tri.p3);
break;
//goto finish;
}
}
t++;
}
// finish:
return(Center);
}
//计算单点特定时刻是否被遮挡
public static bool SinglePointShelter(Vertex3 ObP, t3DModel model, Vector3 Dn)
{
List <string> sunside = new List <string>();
bool Shelter = false;
for (int i = 1; i < model.numOfObjects; i++)
{
t3DObject pObject = model.pObject[i]; //模型中的体
for (int j = 0; j < pObject.numOfFaces; j++) //体的面
{
Vertex3[] p = new Vertex3[3];
//获取面的顶点坐标
for (int k = 0; k < 3; k++)
{
int index = pObject.pFaces[j].vertIndex[k];
Vertex3 pi = new Vertex3(pObject.pVerts[index].x, pObject.pVerts[index].y, pObject.pVerts[index].z);//每一个三角面顶点坐标
p[k] = pi;
}
Triangle Tri = new Triangle(p[0], p[1], p[2]);
//计算三角面的法向量
Tri.CalculateVectorNorm();
//判断三角面是否是阳面，如果是阳面则做点是否被其遮挡判断
Tri.SunnySide(Dn);
if (Tri.IsSunnySide)
{
sunside.Add(i + ";" + j);
//if (IntersectJudge(Tri.Vn, Tri.p1, ObP, Dn))
//{
// Shelter = true;
// break;
//}
}
}
//if (Shelter) break;
}
return(Shelter);
}
