public BasicMaterial()

{
  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;
}

{
  // Create BasicMaterial with default values
  BasicMaterial material = new BasicMaterial();
  System.Windows.Media.Color color = material.Color;         // color = Colors.Black
  System.Windows.Media.Color edgeColor = material.EdgeColor; // edgeColor = Colors.Black
  int edgeWidth = material.EdgeWidth;                        // edgeWidth = 0
  int transparency = material.TransparencyPercent;           // transparency = 0
  int shininess = material.Shininess;                        // shininess = 0
  bool cullBackFace = material.IsCullBackFace;               // cullBackFace = false

  // Modify the properties
  material.Color = System.Windows.Media.Colors.Red;
  material.EdgeColor = System.Windows.Media.Colors.Blue;
  material.EdgeWidth = 10;
  material.TransparencyPercent = 50;
  material.Shininess = 25;
  material.IsCullBackFace = true;
}