USAGES:

VDB
- For Houdini users, just Import the Clouds as .(VDB).

- For 3d Studio Max users who uses 3Delight render Just use the 'OpenVDB' button.

- In Maya there is a plug-In to open .vdb files called: Soup.

If you are using Arnold renderer, you can import the vdb via the arnold menu > volume > then just assign a aivolume shader.

OBJ
If you have no other options, you can get a .obj, wich can be verry intensive in the viewport.You can also use the .OBJ files:

- For All 3d Applications you can simply import the cloud .obj file as polygon, and add a VolumeShader to it from your render engine. Al shaders comes with a density slider to control the density.

ps. vdb is the fastest for rendering and for your viewport