AcTools.Kn5File.Kn5.ExportCollada_Skinned C# (CSharp) Method

        private void ExportCollada_Skinned(XmlWriter xml, Kn5Node node) {
            switch (node.NodeClass) {
                case Kn5NodeClass.Base:
                    foreach (var child in node.Children) {
                        ExportCollada_Skinned(xml, child);
                    }
                    break;

                case Kn5NodeClass.Mesh:
                    return;

                case Kn5NodeClass.SkinnedMesh:
                    xml.WriteStartElement("controller");
                    xml.WriteAttributeStringSafe("id", $"{node.Name}Controller");

                    xml.WriteStartElement("skin");
                    xml.WriteAttributeStringSafe("source", $"#{node.Name}-mesh");

                    // xml.WriteElementString("bind_shape_matrix", "1 0 0 0 0 0 1 0 0 -1 0 0 0 0 0 1");
                    xml.WriteElementString("bind_shape_matrix", "1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1");

                    // Joints
                    xml.WriteStartElement("source");
                    xml.WriteAttributeStringSafe("id", $"{node.Name}Controller-Joints");

                    xml.WriteStartElement("Name_array");
                    xml.WriteAttributeStringSafe("id", $"{node.Name}Controller-Joints-array");
                    xml.WriteAttributeString("count", node.Bones.Length);
                    xml.WriteString(node.Bones.Select(x => x.Name).JoinToString(" "));
                    xml.WriteEndElement(); // Name_array

                    xml.WriteStartElement("technique_common");
                    xml.WriteStartElement("accessor");
                    xml.WriteAttributeStringSafe("source", $"#{node.Name}Controller-Joints-array");
                    xml.WriteAttributeString("count", node.Bones.Length);
                    xml.WriteAttributeString("stride", 1);
                    xml.WriteStartElement("param");
                    xml.WriteAttributeString("name", "JOINT");
                    xml.WriteAttributeString("type", "name");
                    xml.WriteEndElement(); // param
                    xml.WriteEndElement(); // accessor
                    xml.WriteEndElement(); // technique_common
                    xml.WriteEndElement(); // source (Joints)

                    // Matrices
                    xml.WriteStartElement("source");
                    xml.WriteAttributeStringSafe("id", $"{node.Name}Controller-Matrices");

                    xml.WriteStartElement("float_array");
                    xml.WriteAttributeStringSafe("id", $"{node.Name}Controller-Matrices-array");
                    xml.WriteAttributeString("count", node.Bones.Length * 16);
                    xml.WriteString(node.Bones.Select(x => XmlWriterExtension.MatrixToCollada(x.Transform))
                                        .JoinToString(" "));
                    xml.WriteEndElement(); // float_array

                    xml.WriteStartElement("technique_common");
                    xml.WriteStartElement("accessor");
                    xml.WriteAttributeStringSafe("source", $"#{node.Name}Controller-Matrices-array");
                    xml.WriteAttributeString("count", node.Bones.Length);
                    xml.WriteAttributeString("stride", 16);
                    xml.WriteStartElement("param");
                    xml.WriteAttributeString("name", "TRANSFORM");
                    xml.WriteAttributeString("type", "float4x4");
                    xml.WriteEndElement(); // param
                    xml.WriteEndElement(); // accessor
                    xml.WriteEndElement(); // technique_common
                    xml.WriteEndElement(); // source (Matrices)

                    // Weights
                    xml.WriteStartElement("source");
                    xml.WriteAttributeStringSafe("id", $"{node.Name}Controller-Weights");

                    xml.WriteStartElement("float_array");
                    xml.WriteAttributeStringSafe("id", $"{node.Name}Controller-Weights-array");

                    var weights = node.VerticeWeights.SelectMany(x => x.Weights.Where((y, i) => !Equals(x.Indices[i], -1f))).ToList();
                    xml.WriteAttributeString("count", weights.Count);
                    xml.WriteString(weights.JoinToString(" "));
                    xml.WriteEndElement(); // float_array

                    xml.WriteStartElement("technique_common");
                    xml.WriteStartElement("accessor");
                    xml.WriteAttributeStringSafe("source", $"#{node.Name}Controller-Weights-array");
                    xml.WriteAttributeString("count", weights.Count);
                    xml.WriteAttributeString("stride", 1);
                    xml.WriteStartElement("param");
                    xml.WriteAttributeString("name", "WEIGHT");
                    xml.WriteAttributeString("type", "float");
                    xml.WriteEndElement(); // param
                    xml.WriteEndElement(); // accessor
                    xml.WriteEndElement(); // technique_common
                    xml.WriteEndElement(); // source (Matrices)
                    
                    xml.WriteStartElement("joints");
                    xml.WriteStartElement("input");
                    xml.WriteAttributeString("semantic", "JOINT");
                    xml.WriteAttributeStringSafe("source", $"#{node.Name}Controller-Joints");
                    xml.WriteEndElement(); // input
                    xml.WriteStartElement("input");
                    xml.WriteAttributeString("semantic", "INV_BIND_MATRIX");
                    xml.WriteAttributeStringSafe("source", $"#{node.Name}Controller-Matrices");
                    xml.WriteEndElement(); // input
                    xml.WriteEndElement(); // joints

                    xml.WriteStartElement("vertex_weights");
                    xml.WriteAttributeString("count", node.Vertices.Length);

                    xml.WriteStartElement("input");
                    xml.WriteAttributeString("semantic", "JOINT");
                    xml.WriteAttributeString("offset", 0);
                    xml.WriteAttributeStringSafe("source", $"#{node.Name}Controller-Joints");
                    xml.WriteEndElement(); // input
                    xml.WriteStartElement("input");
                    xml.WriteAttributeString("semantic", "WEIGHT");
                    xml.WriteAttributeString("offset", 1);
                    xml.WriteAttributeStringSafe("source", $"#{node.Name}Controller-Weights");
                    xml.WriteEndElement(); // input

                    xml.WriteElementString("vcount", node.VerticeWeights.Select(x => x.Weights.Where(y => !Equals(y, 0f)).Count()).JoinToString(" "));
                    var k = 0;
                    xml.WriteElementString("v", node.VerticeWeights.SelectMany(x =>
                            x.Indices.Where(y => !Equals(y, -1f)).SelectMany((y, i) => new[] { y, k++ })).JoinToString(" "));

                    xml.WriteEndElement(); // vertex_weights

                    xml.WriteEndElement(); // skin
                    xml.WriteEndElement(); // controller
                    break;
            }

        }