Renderering

As stated in the previous guide (Basics), entities do not automagically know how to render themselves. You will need to create your own renderer file so you can render your own mob.

Creating Your First Renderer

Navigate yourself over to the net.minecraft.client.renderer.entity package, this is where we will start on our rendering class. Let's create the ZombieCloneRenderer class to get started, since we are just making a clone of the zombie, let's have it extend the AbstractZombieRenderer with <ZombieClone, ZombieModel<ZombieClone>>. After that you should have a class that looks like:

@OnlyIn(Dist.CLIENT)
public class ZombieCloneRenderer extends AbstractZombieRenderer<ZombieClone, ZombieModel<ZombieClone>>{
    public ZombieCloneRenderer(EntityRendererProvider.Context p_174456_) {
        this(p_174456_, ModelLayers.ZOMBIE, ModelLayers.ZOMBIE_INNER_ARMOR, ModelLayers.ZOMBIE_OUTER_ARMOR);
    }

    public ZombieCloneRenderer(EntityRendererProvider.Context p_174458_, ModelLayerLocation p_174459_, ModelLayerLocation p_174460_, ModelLayerLocation p_174461_) {
        super(p_174458_, new ZombieModel<>(p_174458_.bakeLayer(p_174459_)), new ZombieModel<>(p_174458_.bakeLayer(p_174460_)), new ZombieModel<>(p_174458_.bakeLayer(p_174461_)));
    }
}

This will tell the game how to render our mob, and when we register it will stop the crashing from earlier.

Now that we have created our renderer, we need to go to the EntityRenderers class. In here you should scroll down until you see:

static {
    register(EntityType.ALLAY, AllayRenderer::new);
    register(EntityType.AREA_EFFECT_CLOUD, NoopRenderer::new);
    register(EntityType.ARMOR_STAND, ArmorStandRenderer::new);
    register(EntityType.ARROW, TippableArrowRenderer::new);
    register(EntityType.AXOLOTL, AxolotlRenderer::new);
    register(EntityType.BAT, BatRenderer::new);
    register(EntityType.BEE, BeeRenderer::new);
    register(EntityType.BLAZE, BlazeRenderer::new);
    register(EntityType.BLOCK_DISPLAY, DisplayRenderer.BlockDisplayRenderer::new);
    ...
}

Under the register(EntityType.ZOMBIE, ZombieRenderer::new); we'll add the line:

register(EntityType.ZOMBIE_CLONE, ZombieCloneRenderer::new);

You can now go in-game and your mob will now work!