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I've created a spear item which, when used, throws a custom arrow entity. I've set up a renderer which is basically copied from the vanilla arrow renderers, and it does nearly what I want. The only problem is that I've used a custom texture which is based on the format of the arrow texture but longer than the vanilla arrow (here is the image file). But when the entity renders, it cuts off the longer part and shortens it to the length of a vanilla arrow. Here is my render class, (all the code is on github): So, all I want to know is, where in the rendering code does it define the length of the rendered entity and the section of the image that it uses. I am completely confused by the way most rendering code works, and it's not documented well enough for me to figure it out by reading. Can anyone point me in the right direction?