VTK Multiple Blocks in One File

Hi, I am relatively new to VTK, and I am using it with Qt.

I am trying to create a vtk file (XML based) that allows me to have multiple blocks/pieces (each an unstructured grid) in a single file. I have managed to create individual vtu files for each block/part, and then to create a parent pvd file which when read in works great.

However when I have 15-20 parts, that’s 15-20 files. I want just 1 file that contains everything.

Could I maybe somehow zip all the files together, and open the zip file with vtk?

I have tried to put the code for each file in a <component> tag but that doesnt seem to work.

Any help would be appreciated.

Anyone have any ideas?