/// <summary>
/// Initializes a new instance of the <c>Face3D</c> class.
/// </summary>
/// <param name="firstVertex">Face3D <see cref="Vector3">first vertex</see>.</param>
/// <param name="secondVertex">Face3D <see cref="Vector3">second vertex</see>.</param>
/// <param name="thirdVertex">Face3D <see cref="Vector3">third vertex</see>.</param>
/// <param name="fourthVertex">Face3D <see cref="Vector3">fourth vertex</see>.</param>
public Face3D(Vector3 firstVertex, Vector3 secondVertex, Vector3 thirdVertex, Vector3 fourthVertex)
: base(EntityType.Face3D, DxfObjectCode.Face3d)
{
this.firstVertex = firstVertex;
this.secondVertex = secondVertex;
this.thirdVertex = thirdVertex;
this.fourthVertex = fourthVertex;
this.edgeFlags = Face3DEdgeFlags.None;
}
/// <summary>
/// Decompose the actual polyface mesh faces in <see cref="Point">points</see> (one vertex polyface mesh face),
/// <see cref="Line">lines</see> (two vertexes polyface mesh face) and <see cref="Face3D">3d faces</see> (three or four vertexes polyface mesh face).
/// </summary>
/// <returns>A list of <see cref="Face3D">3d faces</see> that made up the polyface mesh.</returns>
public List <EntityObject> Explode()
{
List <EntityObject> entities = new List <EntityObject>();
foreach (PolyfaceMeshFace face in this.faces)
{
AciColor faceColor = face.Color == null ? this.Color : face.Color;
Layer faceLayer = face.Layer == null ? this.Layer : face.Layer;
if (face.VertexIndexes.Length == 1)
{
Point point = new Point
{
Layer = (Layer)faceLayer.Clone(),
Linetype = (Linetype)this.Linetype.Clone(),
Color = (AciColor)faceColor.Clone(),
Lineweight = this.Lineweight,
Transparency = (Transparency)this.Transparency.Clone(),
LinetypeScale = this.LinetypeScale,
Normal = this.Normal,
Position = this.Vertexes[Math.Abs(face.VertexIndexes[0]) - 1],
};
entities.Add(point);
continue;
}
if (face.VertexIndexes.Length == 2)
{
Line line = new Line
{
Layer = (Layer)faceLayer.Clone(),
Linetype = (Linetype)this.Linetype.Clone(),
Color = (AciColor)faceColor.Clone(),
Lineweight = this.Lineweight,
Transparency = (Transparency)this.Transparency.Clone(),
LinetypeScale = this.LinetypeScale,
Normal = this.Normal,
StartPoint = this.Vertexes[Math.Abs(face.VertexIndexes[0]) - 1],
EndPoint = this.Vertexes[Math.Abs(face.VertexIndexes[1]) - 1],
};
entities.Add(line);
continue;
}
Face3DEdgeFlags edgeVisibility = Face3DEdgeFlags.None;
short indexV1 = face.VertexIndexes[0];
short indexV2 = face.VertexIndexes[1];
short indexV3 = face.VertexIndexes[2];
// Polyface mesh faces are made of 3 or 4 vertexes, we will repeat the third vertex if the number of face vertexes is three
int indexV4 = face.VertexIndexes.Length == 3 ? face.VertexIndexes[2] : face.VertexIndexes[3];
if (indexV1 < 0)
{
edgeVisibility |= Face3DEdgeFlags.First;
}
if (indexV2 < 0)
{
edgeVisibility |= Face3DEdgeFlags.Second;
}
if (indexV3 < 0)
{
edgeVisibility |= Face3DEdgeFlags.Third;
}
if (indexV4 < 0)
{
edgeVisibility |= Face3DEdgeFlags.Fourth;
}
Vector3 v1 = this.Vertexes[Math.Abs(indexV1) - 1];
Vector3 v2 = this.Vertexes[Math.Abs(indexV2) - 1];
Vector3 v3 = this.Vertexes[Math.Abs(indexV3) - 1];
Vector3 v4 = this.Vertexes[Math.Abs(indexV4) - 1];
Face3D face3D = new Face3D
{
Layer = (Layer)faceLayer.Clone(),
Linetype = (Linetype)this.Linetype.Clone(),
Color = (AciColor)faceColor.Clone(),
Lineweight = this.Lineweight,
Transparency = (Transparency)this.Transparency.Clone(),
LinetypeScale = this.LinetypeScale,
Normal = this.Normal,
FirstVertex = v1,
SecondVertex = v2,
ThirdVertex = v3,
FourthVertex = v4,
EdgeFlags = edgeVisibility,
};
entities.Add(face3D);
}
return(entities);
}
