For few days i exploring this forum and can't find anything. I've seen variants like Minecraft.getInstance().getRenderManager() but Minecraft class doesn't have a getRenderManager method.

9 minutes ago, diesieben07 said:

The method is called getEntityRenderDispatcher in Mojang names. You can use the forge bot on the forge discord to convert.

Thanks. But to add layer we need to pass renderer into Layer constructor. And getEntityRenderDispatcher().getRenderer() requires an Entity.

I've done that with

Minecraft.getInstance().getEntityRenderDispatcher().getSkinMap().forEach((string, render) ->
   render.addLayer(new TestLayer<>(render))
);

Thanks