SS3D: custom mesh format loading

mesh = unserialize( io_file_read( "testdata/bunny.ssm" ) );
_R.MeshVD = _R.SS3D.createVertexDecl( mesh.format );
_R.Mesh.setVertexData( mesh.vdata, _R.MeshVD, false );
_R.Mesh.setIndexData( mesh.idata, true );
_R.Mesh.numParts = 1;
_R.Mesh.setPart( 0, null, 0, mesh.vcount, 0, mesh.icount );