I have been trying this for a while now and I can not figure out a way to do this.

 

is there anyway to do this and if so how?

As of 1.8 IItemRenderer has been deprecated and EntityItem is always rendered the same (using .json model).

 

To "override" it you would need to make custom EntityItem (extension) with custom renderer registered (like for any other entity).

Then operate on your custom renderer.

 

That's what I did ;p

 

P.S - I might not understood your problem - you could be more precise

thanks what probably will help but I have one more question how would I do this if I have a block?

Are you talking about placed block or block as an item?

 

Block as an item (in inventory) are represented by ItemBlock (or BlockItem, i don't remember) and when dropped into world they are still treated as EntityItem.

 

If you are referring to placed-blocks then there are several ways.

If you are looking for simple, yet not cubic shape:

Have look at how .json models work (Blocks section):

http://greyminecraftcoder.blogspot.co.at/p/list-of-topics.html

Code examples:

http://www.minecraftforge.net/forum/index.php/topic,26267.0.html

 

For more advanced stuff (custom models) you will need TileEntitySpecialRenderer or ISmartBlockModel, depends on what you want to render. All those classes are either in minecraft.client package or minecraftforge.client.model

 

I don't have much experience here aside from very simple renderer for my crystals Ask TGG (GreyGhost), he's probably dealing with those lately.

I am talking about ItemBlocks aka the block in the inventory.

Well, the examples I linked tell how to add renderer to block when it's in inventory.

 

https://github.com/TheGreyGhost/MinecraftByExample/blob/master/src/main/java/minecraftbyexample/mbe01_block_simple/StartupClientOnly.java

 

This is ofc. based on .json model.

 

If you ought to use other renderer then I can't help you - each works differently, there is no universal answer here.

Post some code and what you are trying / tried.