Thanks, but now I have the 3d model in hand (and in inventory bcz I won't need that anymore) but now when I try to throw it, it doesnt rotate and its just the end of the trident not the head part.
Edit: I removed the 3d custom model. I use the original minecraft files. Json and etc. In minecraft the rendering is made in code. I sent the code in the first message. I have mostly the code. But I don't know how to register the renderers like minecraft do. For example, in minecraft there are 2 jsons: trident_in_hand and trident_throwing , I have both of them. They don't render while I have the item in hand. That's the main problem. I checked the code but I still can't figure out how to register and render the entity basically, in hand