public bool Intersect(Plane3D b, out Line3D intersection)
{
intersection = null;
if (IsParallel(b))
{
return(false);
}
Point3D p;
Vector3D v1 = Normal.CrossProduct(b.Normal);
Vector3D v2 = new Vector3D(v1.X * v1.X, v1.Y * v1.Y, v1.Z * v1.Z);
double w1 = -Distance;
double w2 = -b.Distance;
double id;
if ((v2.Z > v2.Y) && (v2.Z > v2.X) && (v2.Z > Double.Epsilon))
{
// point on XY plane
id = 1.0 / v1.Z;
p = new Point3D(Normal.Y * w2 - b.Normal.Y * w1,
b.Normal.X * w1 - Normal.X * w2,
0.0);
}
else if ((v2.Y > v2.X) && (v2.Y > Double.Epsilon))
{
// point on XZ plane
id = -1.0 / v1.Y;
p = new Point3D(Normal.Z * w2 - b.Normal.Z * w1,
0.0,
b.Normal.Y * w1 - Normal.Y * w2);
}
else if (v2.X > Double.Epsilon)
{
// point on YZ plane
id = 1.0 / v1.X;
p = new Point3D(0.0,
Normal.Z * w2 - b.Normal.Z * w1,
b.Normal.Y * w1 - Normal.Y * w2);
}
else
{
return(false);
}
p = (p.ToVector() * id).ToPoint();
id = 1.0 / Math.Sqrt(v2.X + v2.Y + v2.Z);
v1 *= id;
intersection = new Line3D(p, p.ToVector() + v1);
return(true);
}
public Slice3D(Vector3D normal, Point3D topLeft, double width, double height)
{
Vector3D right = normal.Rotate(Vector3D.AxisY, -90.0);
Vector3D down = normal.Rotate(Vector3D.AxisX, -90.0);
_topLeft = topLeft;
_topRight = _topLeft + (right * width);
_bottomLeft = _topLeft + (down * height);
_bottomRight = _bottomLeft + (right * width);
_normal = normal;
_width = width;
_height = height;
_plane = new Plane3D(normal, _topLeft);
}
public bool IsParallel(Plane3D plane)
{
return(Normal == plane.Normal);
}
public Slice3D(Vector3D normal, Point3D topLeft, double width, double height)
{
Vector3D right = normal.Rotate(Vector3D.AxisY, -90.0);
Vector3D down = normal.Rotate(Vector3D.AxisX, -90.0);
_topLeft = topLeft;
_topRight = _topLeft + (right * width);
_bottomLeft = _topLeft + (down * height);
_bottomRight = _bottomLeft + (right * width);
_normal = normal;
_width = width;
_height = height;
_plane = new Plane3D(normal, _topLeft);
}
public bool Intersect(Plane3D b, out Line3D intersection)
{
intersection = null;
if (IsParallel(b)) return false;
Point3D p;
Vector3D v1 = Normal.CrossProduct(b.Normal);
Vector3D v2 = new Vector3D(v1.X * v1.X, v1.Y * v1.Y, v1.Z * v1.Z);
double w1 = -Distance;
double w2 = -b.Distance;
double id;
if ((v2.Z > v2.Y) && (v2.Z > v2.X) && (v2.Z > Double.Epsilon))
{
// point on XY plane
id = 1.0 / v1.Z;
p = new Point3D(Normal.Y * w2 - b.Normal.Y * w1, b.Normal.X * w1 - Normal.X * w2, 0.0);
}
else if ((v2.Y > v2.X) && (v2.Y > Double.Epsilon))
{
// point on XZ plane
id = -1.0 / v1.Y;
p = new Point3D(Normal.Z * w2 - b.Normal.Z * w1, 0.0, b.Normal.Y * w1 - Normal.Y * w2);
}
else if (v2.X > Double.Epsilon)
{
// point on YZ plane
id = 1.0 / v1.X;
p = new Point3D(0.0, Normal.Z * w2 - b.Normal.Z * w1, b.Normal.Y * w1 - Normal.Y * w2);
}
else return false;
p = (p.ToVector() * id).ToPoint();
id = 1.0 / Math.Sqrt(v2.X + v2.Y + v2.Z);
v1 *= id;
intersection = new Line3D(p, p.ToVector() + v1);
return true;
}
public bool IsParallel(Plane3D plane)
{
return Normal == plane.Normal;
}
