Exemple #1
0
        private bool is3ds;      // usd to shwo that the 4D4D magic number has been found


        public IOReadResult Read(BinaryReader reader, ReadOptions options, IMeshBuilder builder)
        {
            ushort ChunkID;
            String ChnkID = "";
            UInt32 Clength;

            MeshName = "";
            hasMesh  = false;
            is3ds    = false;

            // Process the file - fails very politely when there is no more data
            while (true)
            {
                //Get the Id of the next Chunk
                try {
                    ChunkID = reader.ReadUInt16();
                } catch {
                    break;
                }
                ChnkID = ChunkID.ToString("X");

                //Get the size of the next chunk in chars
                Clength = reader.ReadUInt32();

                //Process based on Chunk ID
                switch (ChnkID)
                {
                case "4D4D":
                    //This is a new file header
                    is3ds = true;
                    reader.ReadChars(10);
                    break;

                case "3D3D":
                    //This is a new Object Header
                    reader.ReadChars(10);
                    break;

                case "4000":
                    //This is an object Block. Store the name temporarily in case it is a mesh
                    List <char> name = new List <char>();
                    while (true)
                    {
                        char next = reader.ReadChar();
                        if (next == 0)
                        {
                            break;
                        }
                        name.Add(next);
                    }
                    MeshName = new String(name.ToArray <char>());
                    break;

                case "4100":
                    // This is a new Mesh. Retrieve the name and add if the builder supports Metadata
                    builder.AppendNewMesh(false, false, false, false);
                    if (builder.SupportsMetaData)
                    {
                        builder.AppendMetaData("name", MeshName);
                    }
                    break;

                case "4110":
                    // List of Vertexes
                    ushort VertexCount = reader.ReadUInt16();
                    for (int x = 0; x < VertexCount; x++)
                    {
                        double X = reader.ReadSingle();
                        double Y = reader.ReadSingle();
                        double Z = reader.ReadSingle();
                        builder.AppendVertex(X, Y, Z);
                    }
                    break;

                case "4120":
                    // List of Triangles
                    ushort PolygonCount = reader.ReadUInt16();
                    for (int j = 0; j < PolygonCount; j++)
                    {
                        int a     = reader.ReadInt16();
                        int b     = reader.ReadInt16();
                        int c     = reader.ReadInt16();
                        int flags = reader.ReadUInt16();
                        builder.AppendTriangle(a, b, c);
                    }
                    break;

                case "4130":
                    // Mapping from Vertex to Material - retrieved but not currently used
                    List <char> mname = new List <char>();
                    while (true)
                    {
                        char next = reader.ReadChar();
                        if (next == 0)
                        {
                            break;
                        }
                        mname.Add(next);
                    }
                    string MatName = new String(mname.ToArray <char>());
                    ushort entries = reader.ReadUInt16();
                    for (int i = 0; i < entries; i++)
                    {
                        ushort face = reader.ReadUInt16();
                    }
                    break;

                case "4140":
                    // List of UVs per vertex
                    ushort uvCount = reader.ReadUInt16();
                    for (ushort y = 0; y < uvCount; y++)
                    {
                        Vector2f UV = new Vector2f(reader.ReadSingle(), reader.ReadSingle());
                        builder.SetVertexUV(y, UV);
                    }
                    break;

                default:
                    // Any other chunk - retrieved and not used - held in dump temporarily for debug
                    char[] dump = reader.ReadChars((int)Clength - 6);
                    break;
                }
            }
            if (!is3ds)
            {
                return(new IOReadResult(IOCode.FileAccessError, "File is not in .3DS format"));
            }
            else if (!hasMesh)
            {
                return(new IOReadResult(IOCode.FileParsingError, "no mesh found in file"));
            }
            else
            {
                return(new IOReadResult(IOCode.Ok, ""));
            }
        }