static public IEnumerable <Vector3> GetTriangleIntersection(this Bounds item, Triangle3 triangle)
{
if (triangle.IsDegenerate() == false)
{
Plane plane = triangle.GetPlane();
if (plane.normal != Vector3.zero)
{
if (item.FullyContains(triangle))
{
return(triangle.GetPoints());
}
PlaneSpace plane_space = plane.GetPlaneSpace();
ConvexPolygon plane_polygon = new ConvexPolygon(
plane_space.ProjectPoints(item.GetPlaneIntersection(plane))
);
ConvexPolygon triangle_polygon = new ConvexPolygon(
plane_space.ProjectPoints(triangle.GetPoints())
);
return(plane_space.InflatePoints(
plane_polygon.GetIntersection(triangle_polygon).GetVertexs()
).Narrow(p => item.Contains(p)));
}
}
return(Empty.IEnumerable <Vector3>());
}
static public bool IsPointWithin(this ConvexPolygon item, Vector2 point, float tolerance = 0.0f)
{
if (item.GetFaces().AreAll(f => f.IsInside(point, tolerance)))
{
return(true);
}
return(false);
}
static public ConvexPolygon GetIntersection(this ConvexPolygon item, Plane2 plane)
{
ConvexPolygon intersection = new ConvexPolygon();
intersection.AddVertexs(item.GetVertexs().Narrow(v => plane.IsInside(v)));
Vector2 point;
foreach (Face face in item.GetFaces())
{
if (face.IsIntersecting(plane, out point))
{
intersection.AddVertex(point);
}
}
return(intersection);
}
static public ConvexPolygon GetIntersection(this ConvexPolygon item, ConvexPolygon other)
{
ConvexPolygon intersection = new ConvexPolygon();
intersection.AddVertexs(item.GetVertexs().Narrow(v => other.IsPointWithin(v)));
intersection.AddVertexs(other.GetVertexs().Narrow(v => item.IsPointWithin(v)));
Vector2 point;
foreach (Face face1 in item.GetFaces())
{
foreach (Face face2 in other.GetFaces())
{
if (face1.IsIntersecting(face2, out point))
{
intersection.AddVertex(point);
}
}
}
return(intersection);
}
static public IEnumerable <Vector2> GetNormals(this ConvexPolygon item)
{
return(item.GetFaces().Convert(f => f.normal));
}
static public IEnumerable <Vector2> GetVertexs(this ConvexPolygon item)
{
return(item.GetFaces().Convert(f => f.v0));
}
static public void AddVertexs(this ConvexPolygon item, params Vector2[] vertexs)
{
item.AddVertexs((IEnumerable <Vector2>)vertexs);
}
static public void AddVertexs(this ConvexPolygon item, IEnumerable <Vector2> vertexs)
{
vertexs.Process(v => item.AddVertex(v));
}