Tetrahedral meshes and volumetric textures

I’m doing some research on volumetric modeling. I’m using OpenGL to visualize and process volumetric meshes, mostly tetrahedral meshes.
Therefore, I’m looking for a data sets of tetrahedral meshes and volumetric textures.
I prefer textual files, but generally files can be in any readable format.
Basically, I’m looking for a data set of 3D images, or tetrahedral meshes with attributes that correspond to texture values.
The last one is preferable, but I guess it’s hard to find.

Any help will be greatly appreciated :slight_smile: