Hello i am wondering what would be the best way to approach a system that loads a model but when the entity is e.g. 20 blocks away it would load a different model.

Utilize your renderer class. In the render method check the distance to the client's player, if it is less than the distance you want then change the RenderLivingBase.mainModel field's value to your other model. Or override RenderLivingBase#renderModel and render a different model there.

12 hours ago, V0idWa1k3r said:

Utilize your renderer class. In the render method check the distance to the client's player, if it is less than the distance you want then change the RenderLivingBase.mainModel field's value to your other model. Or override RenderLivingBase#renderModel and render a different model there.

That worked perfect thank you