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 UpdateCurrentFace(Viewport3D viewport, ViewportEvent e)
{
var ray = viewport.CastRayFromScreen(e.X, e.Y);
// The face doesn't change when drawing, just update the intersection
if (_state == SketchState.DrawingBase || _state == SketchState.DrawingVolume)
{
_intersection = (_state == SketchState.DrawingBase ? _currentFace.Plane : _volumePlane).GetIntersectionPoint(ray, true, true);
return;
}
var isect = Document.Map.WorldSpawn.GetAllNodesIntersectingWith(ray)
.OfType<Solid>()
.SelectMany(x => x.Faces)
.Select(x => new { Item = x, Intersection = x.GetIntersectionPoint(ray) })
.Where(x => x.Intersection != null)
.OrderBy(x => (x.Intersection - ray.Start).VectorMagnitude())
.FirstOrDefault();
if (isect != null)
{
if (_currentFace != isect.Item)
{
_cloneFace = isect.Item.Clone();
_cloneFace.Transform(new UnitTranslate(isect.Item.Plane.Normal * 0.1m), TransformFlags.None);
}
_currentFace = isect.Item;
_intersection = isect.Intersection;
_state = SketchState.Ready;
}
else
{
_cloneFace = null;
_currentFace = null;
_intersection = null;
_state = SketchState.None;
}
}
private void BevelFace(Face face, int num)
{
var solid = face.Parent;
var vertexCoordinates = face.Vertices.ToDictionary(x => x, x => x.Location);
// Scale the face a bit and move it away by the bevel distance
face.Transform(new UnitScale(Coordinate.One * 0.9m, face.BoundingBox.Center), TransformFlags.TextureLock);
face.Transform(new UnitTranslate(face.Plane.Normal * num), TransformFlags.TextureLock);
foreach (var edge in face.GetEdges())
{
var v1 = face.Vertices.First(x => x.Location == edge.Start);
var v2 = face.Vertices.First(x => x.Location == edge.End);
var verts = new[] { vertexCoordinates[v1], vertexCoordinates[v2], v2.Location, v1.Location };
var f = new Face(Document.Map.IDGenerator.GetNextFaceID())
{
Parent = solid,
Plane = new Plane(verts[0], verts[1], verts[2]),
Colour = solid.Colour,
Texture = face.Texture.Clone()
};
f.Vertices.AddRange(verts.Select(x => new Vertex(x, face)));
f.UpdateBoundingBox();
f.AlignTextureToFace();
solid.Faces.Add(f);
_selection.Add(f);
}
solid.UpdateBoundingBox();
UpdateSelection();
MainTool.SetDirty(true, true);
}
