/// <summary>
/// For given vertex handler return points that are incident to it
/// Sets boundary as true if given vertex lies on the edge of the mesh
/// </summary>
public static List <int> GetPolygonVerticesAndDelete(int vertexIndex, ref bool boundary, SceneBrep scene)
{
List <int> polygon = new List <int>();
List <int> trianglePointers = new List <int>();
int add1 = 0;
int add2 = 0;
for (int i = 0; i < scene.vertexPtr.Count; i++)
{
// found triangle such that one corner is selected vertex
if (scene.vertexPtr[i] == vertexIndex)
{
// if it's main triangle handle
if (i % 3 == 0)
{
// get the remaining triangle corners
add1 = i + 1;
add2 = i + 2;
// get triangle handle
trianglePointers.Add(i);
}
else if (i % 3 == 1)
{
add1 = i - 1;
add2 = i + 1;
trianglePointers.Add(i - 1);
}
else if (i % 3 == 2)
{
add2 = i - 1;
add1 = i - 2;
trianglePointers.Add(i - 2);
}
if (!polygon.Contains(scene.vertexPtr[add1]))
{
polygon.Add(scene.vertexPtr[add1]);
}
if (!polygon.Contains(scene.vertexPtr[add2]))
{
polygon.Add(scene.vertexPtr[add2]);
}
}
}
// CCW order of points in polygon
ReorderPoints(ref polygon, trianglePointers, vertexIndex, scene.vertexPtr, ref boundary);
trianglePointers.ForEach(x => scene.FreeTriangleSpace(x));
return(polygon);
}
