[Raypp-general] Suggestion for Load3DS()

[Martin R. <ma...@MP...>]

Hi Andreas,

I have put together a version of Load3DS() which uses the new bifstream class.
Does this look OK?

Cheers,
   Martin


/* Function to load a triangle mesh from a 3DS file
    based on code of Damiano Vitulli <in...@sp...> */
bool TRIANGLE_MESH::Load3DS (const char *filename)
   {
   bifstream file (filename,file_is_lsb);
   if (!file) return false;
   while (!file.eof())
     {
     uint2 chunk_id,qty;
     uint4 chunk_length;
     file >> chunk_id;
     file >> chunk_length;
     cout << "Chunk ID: " << chunk_id << " Length:" << chunk_length << endl;
     switch (chunk_id)
       {
       // TRI_VERTEXL: Vertices list
       // Chunk Length: 1 x uint2 (number of vertices)
       //             + 3 x float4 (vertex coordinates) x (number of vertices)
       //             + sub chunks
       case 0x4110:
         file >> qty;
         cout << "Vertices list: " << qty << " vertices" << endl;
         for (int i=0; i<qty; ++i)
           {
           float4 x, y, z;
           file >> x >> y >> z;
           AddVertex (VECTOR (x, y, z));
           }
         break;

         // TRI_FACEL1: Polygons (faces) list
         // Chunk ID: 4120 (hex)
         // Chunk Length: 1 x uint2 (number of polygons)
         //             + 3 x uint2 (polygon points) x (number of polygons)
         //             + sub chunks
         case 0x4120:
           file >> qty;
           cout << "Faces list: " << qty << " faces" << endl;
           for (int i=0; i<qty; ++i)
             {
             uint2 a, b, c, face_flags;
             file >> a >> b >> c >> face_flags;
             AddTriangle (a, b, c);
             }
           break;

         // EDIT_OBJECT: Object block, info for each object
         case 0x4000:
           cout << "Object block: skipping name" << endl;
           {
           byte c;
           do { file >> c; } while (c!=0);
           }
           break;

         case 0x4d4d: // main chunk
         case 0x3d3d: // editor chunk
         case 0x4100: // triangle mesh chunk
           cout << "  ...superchunk" << endl;
           break;

         // skip all other chunks
         default:
           cout << "  ...skipping" << endl;
           file.seekg(chunk_length-6,ios::cur);
       }
     }
   return true;
   }