public void FaceLineIntersectionTest()
{
var plane = new Plane(new Coordinate(0, 0, 1), 100);
var face = new Face(1) {Plane = plane};
var coords = new[]
{
new Coordinate(-100, -100, 100),
new Coordinate(100, -100, 100),
new Coordinate(100, 100, 100),
new Coordinate(-100, 100, 100)
};
face.Vertices.AddRange(coords.Select(x => new Vertex(x, face)));
face.CalculateTextureCoordinates(true);
var passLine = new Line(new Coordinate(0, 0, 0), new Coordinate(0, 0, 200));
var reversePassLine = passLine.Reverse();
var failSegment = new Line(new Coordinate(0, 0, 0), new Coordinate(0, 0, 50));
var failLine = new Line(new Coordinate(0, 0, 0), new Coordinate(1, 0, 0));
var outsideFaceLine = new Line(new Coordinate(200, 0, 0), new Coordinate(200, 0, 200));
var pass1 = face.GetIntersectionPoint(passLine);
var fail1 = face.GetIntersectionPoint(reversePassLine);
var fail2 = face.GetIntersectionPoint(failSegment);
var fail3 = face.GetIntersectionPoint(failLine);
var fail4 = face.GetIntersectionPoint(outsideFaceLine);
Assert.IsNotNull(pass1);
Assert.IsNull(fail1);
Assert.IsNull(fail2);
Assert.IsNull(fail3);
Assert.IsNull(fail4);
}
public void CalculateDecalGeometry()
{
_decalGeometry = new List<Face>();
if (Decal == null) return; // Texture not found
var boxRadius = Coordinate.One * 4;
// Decals apply to all faces that intersect within an 8x8x8 bounding box
// centered at the origin of the decal
var box = new Box(Origin - boxRadius, Origin + boxRadius);
var root = GetRoot(Parent);
// Get the faces that intersect with the decal's radius
var faces = root.GetAllNodesIntersectingWith(box).OfType<Solid>()
.SelectMany(x => x.Faces).Where(x => x.IntersectsWithBox(box));
var idg = new IDGenerator(); // Dummy generator
foreach (var face in faces)
{
// Project the decal onto the face
var center = face.Plane.Project(Origin);
var texture = face.Texture.Clone();
texture.Name = Decal.Name;
texture.Texture = Decal;
texture.XShift = -Decal.Width / 2m;
texture.YShift = -Decal.Height / 2m;
var decalFace = new Face(idg.GetNextFaceID())
{
Colour = Colour,
IsSelected = IsSelected,
IsHidden = IsCodeHidden,
Plane = face.Plane,
Texture = texture
};
// Re-project the vertices in case the texture axes are not on the face plane
var xShift = face.Texture.UAxis * face.Texture.XScale * Decal.Width / 2;
var yShift = face.Texture.VAxis * face.Texture.YScale * Decal.Height / 2;
var verts = new[]
{
new Vertex(face.Plane.Project(center + xShift - yShift), decalFace), // Bottom Right
new Vertex(face.Plane.Project(center + xShift + yShift), decalFace), // Top Right
new Vertex(face.Plane.Project(center - xShift + yShift), decalFace), // Top Left
new Vertex(face.Plane.Project(center - xShift - yShift), decalFace) // Bottom Left
};
// Because the texture axes don't have to align to the face, we might have a reversed face here
// If so, reverse the points to get a valid face for the plane.
// TODO: Is there a better way to do this?
var vertPlane = new Plane(verts[0].Location, verts[1].Location, verts[2].Location);
if (!face.Plane.Normal.EquivalentTo(vertPlane.Normal))
{
Array.Reverse(verts);
}
decalFace.Vertices.AddRange(verts);
decalFace.UpdateBoundingBox();
// Calculate the X and Y shift bases on the first vertex location (assuming U/V of first vertex is zero) - we dont want these to change
var vtx = decalFace.Vertices[0];
decalFace.Texture.XShift = -(vtx.Location.Dot(decalFace.Texture.UAxis)) / decalFace.Texture.XScale;
decalFace.Texture.YShift = -(vtx.Location.Dot(decalFace.Texture.VAxis)) / decalFace.Texture.YScale;
decalFace.CalculateTextureCoordinates();
// Next, the decal geometry needs to be clipped to the face so it doesn't spill into the void
// Create a fake solid out of the decal geometry and clip it against all the brush planes
var fake = CreateFakeDecalSolid(decalFace);
foreach (var f in face.Parent.Faces.Except(new[] { face }))
{
Solid back, front;
fake.Split(f.Plane, out back, out front, idg);
fake = back ?? fake;
}
// Extract out the original face
decalFace = fake.Faces.First(x => x.Plane.EquivalentTo(face.Plane, 0.05m));
// Add a tiny bit to the normal axis to ensure the decal is rendered in front of the face
var normalAdd = face.Plane.Normal * 0.2m;
decalFace.Transform(new UnitTranslate(normalAdd), TransformFlags.TextureLock);
_decalGeometry.Add(decalFace);
}
}
private void CreateFace(Polygon polygon, Solid parent, Face original)
{
var verts = polygon.Vertices;
var f = new Face(Document.Map.IDGenerator.GetNextFaceID())
{
Parent = parent,
Plane = new Plane(verts[0], verts[1], verts[2]),
Colour = parent.Colour,
Texture = original.Texture.Clone()
};
f.Vertices.AddRange(verts.Select(x => new Vertex(x, f)));
f.UpdateBoundingBox();
f.CalculateTextureCoordinates(true);
parent.Faces.Add(f);
}
