/*
* /// <summary>
* ///
* /// </summary>
* /// <typeparam name="V"></typeparam>
* /// <typeparam name="E"></typeparam>
* /// <typeparam name="F"></typeparam>
* /// <param name="mesh"></param>
* /// <param name="getPosition"></param>
* /// <param name="quadrangulator"></param>
* /// <returns></returns>
* public static M CreatePolySoup<V, E, F>(HeMesh<V, E, F> mesh, Func<V, Point3f> getPosition, Func<F, Color> getColor = null, IFaceQuadrangulator<V, E, F> quadrangulator = null)
* where V : HeMeshBase<V, E, F>.Vertex
* where E : HeMeshBase<V, E, F>.Halfedge
* where F : HeMeshBase<V, E, F>.Face
* {
* var result = new M();
* var newVerts = result.Vertices;
* var newColors = result.VertexColors;
* var newFaces = result.Faces;
*
* // default quadrangulator
* if (quadrangulator == null)
* quadrangulator = FaceQuadrangulators.Strip.Create(mesh);
*
* // add vertices per face
* foreach (var f in mesh.Faces)
* {
* if (f.IsUnused) continue;
* int nv = newVerts.Count;
* int degree = 0;
*
* // add face vertices
* foreach (var v in f.Vertices)
* {
* newVerts.Add(getPosition(v));
* degree++;
* }
*
* // add colors
* if (getColor != null)
* {
* var c = getColor(f);
* for (int i = 0; i < degree; i++) newColors.Add(c);
* }
*
* // add face(s)
* if (degree == 3)
* {
* newFaces.AddFace(nv, nv + 1, nv + 2);
* }
* else if (degree == 4)
* {
* newFaces.AddFace(nv, nv + 1, nv + 2, nv + 3);
* }
* else
* {
* foreach (var quad in quadrangulator.GetQuads(f))
* {
* if (quad.Item4 == null)
* newFaces.AddFace(nv + quad.Item1, nv + quad.Item2, nv + quad.Item3);
* else
* newFaces.AddFace(nv + quad.Item1, nv + quad.Item2, nv + quad.Item3, nv + quad.Item4);
* }
* }
* }
*
* return result;
* }
*/
/// <summary>
///
/// </summary>
/// <typeparam name="V"></typeparam>
/// <typeparam name="E"></typeparam>
/// <typeparam name="F"></typeparam>
/// <param name="mesh"></param>
/// <param name="getPosition"></param>
/// <param name="quadrangulator"></param>
/// <param name="getNormal"></param>
/// <param name="getTexture"></param>
/// <param name="getColor"></param>
/// <returns></returns>
public static T CreateFromHeMesh <V, E, F>(HeMesh <V, E, F> mesh, Func <V, Point3f> getPosition, Func <V, Vector3f> getNormal = null, Func <V, Point2f> getTexture = null, Func <V, Color> getColor = null, IFaceQuadrangulator <V, E, F> quadrangulator = null)
where V : HeMesh <V, E, F> .Vertex
where E : HeMesh <V, E, F> .Halfedge
where F : HeMesh <V, E, F> .Face
{
var verts = mesh.Vertices;
var result = new T();
var newVerts = result.Vertices;
var newFaces = result.Faces;
var newNorms = result.Normals;
var newCoords = result.TextureCoordinates;
var newColors = result.VertexColors;
// default quadrangulator
if (quadrangulator == null)
{
quadrangulator = FaceQuadrangulator.CreateStrip(mesh);
}
// add vertices
for (int i = 0; i < verts.Count; i++)
{
var v = verts[i];
newVerts.Add(getPosition(v));
if (getNormal != null)
{
newNorms.Add(getNormal(v));
}
if (getTexture != null)
{
newCoords.Add(getTexture(v));
}
if (getColor != null)
{
newColors.Add(getColor(v));
}
}
// add faces
foreach (var f in mesh.Faces)
{
if (f.IsUnused)
{
continue;
}
var he = f.First;
int degree = f.Degree;
if (degree == 3)
{
newFaces.AddFace(
he.Start.Index,
he.Next.Start.Index,
he.Previous.Start.Index
);
}
else if (degree == 4)
{
newFaces.AddFace(
he.Start.Index,
he.Next.Start.Index,
he.Next.Next.Start.Index,
he.Previous.Start.Index
);
}
else
{
foreach (var quad in quadrangulator.GetQuads(f))
{
if (quad.Item4 == null)
{
newFaces.AddFace(quad.Item1, quad.Item2, quad.Item3);
}
else
{
newFaces.AddFace(quad.Item1, quad.Item2, quad.Item3, quad.Item4);
}
}
}
}
return(result);
}
/// <summary>
///
/// </summary>
/// <typeparam name="V"></typeparam>
/// <typeparam name="E"></typeparam>
/// <typeparam name="F"></typeparam>
/// <param name="mesh"></param>
/// <param name="getPosition"></param>
/// <param name="getColor"></param>
/// <param name="quadrangulator"></param>
/// <returns></returns>
public static T CreatePolySoup <V, E, F>(HeMesh <V, E, F> mesh, Func <V, Point3f> getPosition, Func <F, Color> getColor = null, IFaceQuadrangulator <V, E, F> quadrangulator = null)
where V : HeMesh <V, E, F> .Vertex
where E : HeMesh <V, E, F> .Halfedge
where F : HeMesh <V, E, F> .Face
{
var result = new T();
var newVerts = result.Vertices;
var newColors = result.VertexColors;
var newFaces = result.Faces;
// default quadrangulator
if (quadrangulator == null)
{
quadrangulator = FaceQuadrangulator.CreateStrip(mesh);
}
// add vertices per face
foreach (var f in mesh.Faces)
{
if (f.IsUnused)
{
continue;
}
int degree = f.Degree;
int nv = newVerts.Count;
// add colors
if (getColor != null)
{
var c = getColor(f);
for (int i = 0; i < degree; i++)
{
newColors.Add(c);
}
}
// handle n-gons
if (degree > 4)
{
var quads = quadrangulator.GetQuads(f);
// add first 2 vertices
var first = quads.First();
newVerts.Add(getPosition(first.Item1));
newVerts.Add(getPosition(first.Item2));
// add remaining vertices and faces
foreach (var quad in quads)
{
var v0 = quad.Item3;
var v1 = quad.Item4;
if (v1 == null)
{
newVerts.Add(getPosition(v0));
newFaces.AddFace(nv, nv + 1, nv + 2);
break;
}
newVerts.Add(getPosition(v1));
newVerts.Add(getPosition(v0));
newFaces.AddFace(nv, nv + 1, nv + 3, nv + 2);
nv += 2;
}
}
else
{
// add face vertices
foreach (var v in f.Vertices)
{
newVerts.Add(getPosition(v));
}
// add face
if (degree == 3)
{
newFaces.AddFace(nv, nv + 1, nv + 2);
}
else
{
newFaces.AddFace(nv, nv + 1, nv + 2, nv + 3);
}
}
}
return(result);
}
