Custom Minecraft Versions
ObjToSchematic supports locally processing specific Minecraft versions. This is useful when you want to create an atlas for a very specific version of Minecraft. To achieve this you will need to create a custom atlas. By doing this you will only have access to blocks available in this version of Minecraft and all block textures will be rendered as they were in this version of the game.
You probably don't need to do this!
If you only want the editor to use specific Minecraft blocks from a version of the game then you can use the 'Block Palette' setting to restrict what blocks will be use.
A time where it would actually be useful to do this would be if for some reason you wanted to use blocks that are no longer available in the game. For example, blocks only available in the April Fools versions of the game.
To achieve this you will need to create a custom atlas. Visit the 'Custom Atlases' page on how to do this.
Custom Atlases
Create a custom atlas for a specific Minecraft version, resource pack, or mod.