public new Multipatch ToGeometry()

{
  var coords_face1 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495461061000071,41.902603910000039,62.552700000000186),
  new Coordinate3D(12.495461061000071,41.902603910000039,59.504700000004959),
  new Coordinate3D(12.495461061000071,41.902576344000067,59.504700000004959),
  new Coordinate3D(12.495461061000071,41.902603910000039,62.552700000000186),
  new Coordinate3D(12.495461061000071,41.902576344000067,59.504700000004959),
  new Coordinate3D(12.495461061000071,41.902576344000067,62.552700000000186),
};

  var coords_face2 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495461061000071, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 62.552700000000186),
};

  var coords_face3 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495488442000067, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 62.552700000000186),
};

  var coords_face4 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
};

  var coords_face5 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 59.504700000004959),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 62.552700000000186),
};

  var coords_face6 = new List<Coordinate3D>()
{
  new Coordinate3D(12.495488442000067, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495461061000071, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902603910000039, 62.552700000000186),
  new Coordinate3D(12.495461061000071, 41.902576344000067, 62.552700000000186),
  new Coordinate3D(12.495488442000067, 41.902576344000067, 62.552700000000186),
};

  // materials
  var materialRed = new BasicMaterial();
  materialRed.Color = System.Windows.Media.Colors.Red;

  var materialTransparent = new BasicMaterial();
  materialTransparent.Color = System.Windows.Media.Colors.White;
  materialTransparent.TransparencyPercent = 80;

  var blueTransparent = new BasicMaterial(materialTransparent);
  blueTransparent.Color = System.Windows.Media.Colors.SkyBlue;

  // create a list of patch objects
  var patchesList = new List<Patch>();

  // create the multipatchBuilderEx object
  var mpb = new ArcGIS.Core.Geometry.MultipatchBuilderEx();

  // make each patch using the appropriate coordinates and add to the patch list
  var patch = mpb.MakePatch(PatchType.Triangles);
  patch.Coords = coords_face1;
  patchesList.Add(patch);

  patch = mpb.MakePatch(PatchType.Triangles);
  patch.Coords = coords_face2;
  patchesList.Add(patch);

  patch = mpb.MakePatch(PatchType.Triangles);
  patch.Coords = coords_face3;
  patchesList.Add(patch);

  patch = mpb.MakePatch(PatchType.Triangles);
  patch.Coords = coords_face4;
  patchesList.Add(patch);

  patch = mpb.MakePatch(PatchType.Triangles);
  patch.Coords = coords_face5;
  patchesList.Add(patch);

  patch = mpb.MakePatch(PatchType.Triangles);
  patch.Coords = coords_face6;
  patchesList.Add(patch);

  patchesList[0].Material = materialRed;
  patchesList[1].Material = materialTransparent;
  patchesList[2].Material = materialRed;
  patchesList[3].Material = materialRed;
  patchesList[4].Material = materialRed;
  patchesList[5].Material = blueTransparent;

  // assign the patches to the multipatchBuilder
  mpb.Patches = patchesList;

  // check which patches currently contain the material
  var red = mpb.QueryPatchIndicesWithMaterial(materialRed);
  //   red should be [0, 2, 3, 4]
  // call ToGeometry to get the multipatch
  multipatch = mpb.ToGeometry() as Multipatch;
}

{
  TextureResource brickTextureResource = null;
  BasicMaterial brickMaterialTexture = new BasicMaterial();
  var coords = new List<Coordinate3D>();

  // create the multipatchBuilderEx object
  var builder = new ArcGIS.Core.Geometry.MultipatchBuilderEx(multipatch);

  // check some properties
  bool hasM = builder.HasM;
  bool hasZ = builder.HasZ;
  bool hasID = builder.HasID;
  bool isEmpty = builder.IsEmpty;
  bool hasNormals = builder.HasNormals;

  var patches = builder.Patches;
  int patchCount = patches.Count;

  // if there's some patches
  if (patchCount > 0)
  {
    int pointCount = builder.GetPatchPointCount(0);

    // replace the first point in the first patch
    if (pointCount > 0)
    {
      // get the first point
      var pt = builder.GetPoint(0, 0);
      builder.SetPoint(0, 0, mapPoint);
    }

    // check which patches currently contain the texture
    var texture = builder.QueryPatchIndicesWithTexture(brickTextureResource);

    // assign a texture material
    patches[0].Material = brickMaterialTexture;
  }

  // update the builder for M awareness
  builder.HasM = true;
  // synchronize the patch attributes to match the builder attributes
  //   in this instance because we just set HasM to true on the builder, each patch will now get a default M value for it's set of coordinates
  builder.SynchronizeAttributeAwareness();

  // call ToGeometry to get the multipatch
  multipatch = builder.ToGeometry() as Multipatch;

  // multipatch.HasM will be true
}