I am currently making a block that allows you to put an item in it (by right clicking with it). I'm able to get the item, which is easy, but how do I actually start drawing the 3D model of the item into the block (it is going to be inside a glass case)? If you seen Tinkers' Construct's crafting station, it is sort of like that. I would guess you would use tessellator, but a lot of tutorials are either outdated or extremely confusing.

try looking at how the item frame does it

Such Doge, Much Wow, so 3D. Seriously, such majesty, did you come up with that avatar on your own, wow? (I am doge here :C wow, since forever)

 

As to problem: are you asking how to make block render item or how to render item? You probably want TileEntitySpecialRenderer if you want to draw item by frame. Other option would be using static models, but idk how well that will go with many items (also idk how it goes with 1.8.9).

 

Damn, seems like I need to update.