First I used FML 1.8. The texture of the item was rendering correctly.

Now I'm using Forge 1.8 -using the same code and the result is a blocky item with the default "missing texture" - texture.

What has happened?

I don't think there is a mistake because I followed the instructions of Eternaldoom's post: http://www.minecraftforge.net/forum/index.php/topic,24263.0.html

And as I already said, with FML it still worked.

It'd still be nice to see the code though.

Ok...

 

My .json file is located in assets/MODID/models/item

 

In the initialization event of my main class i wrote this:

 

GameRegistry.registerItem(item, "item");

Minecraft.getMinecraft().getRenderItem().getItemModelMesher().register(item, 0, new ModelResourceLocation("MODID:item", "inventory"));

 

Does this help?

Could we also get your JSON file? Sometimes the problem is in there too.