I'd like to make an item that would act as an egg and spawn a custom mob, but is craftable. Is this possible?

If not, how could I make the mob's egg craftable?

Just change the output of the GameRegistry.addShapedRecipe or GameRegistry.addShapelessRecipe to your egg's id.

How would I just use the ID instead of

GameRegistry.addRecipe(new ItemStack(Mod.modItem, 1), new Object[]

?

Haven't figured this out yet, I just need an item that can be crafted and, upon right-clicking a block, spawn an entity.

First make your standard item class and register it and all that in your main mod class, I'm going to assume you know how to add in a custom recipe if not then stop here and go learn about that, because that's easy compared to making your own entity, anyway back to your item class add in this function

 

public boolean onItemUse(ItemStack item, EntityPlayer player, World world, int x, int y, int z, int side, float xOffset, float yOffset, float zOffSet)
{

		if (world.getBlockId(x, y + 1, z) == 0 && (world.getBlockId(x, y, z) == Block.grass.blockID || world.getBlockId(x, y, z) == Block.stone.blockID || world.getBlockId(x, y, z) == Block.dirt.blockID || world.getBlockId(x, y, z) == Block.sand.blockID))
		{
			EntitySkeleton ent = new EntitySkeleton(world); //change to whatever entity you're trying to spawn
			ent.setLocationAndAngles(x, y + 1, z, MathHelper.wrapAngleTo180_float(world.rand.nextFloat() * 360.0F), 0.0F);
			ent.initCreature();
			world.spawnEntityInWorld(ent);
		}
	return true;
}

 

that function will make it when ever they right click, it will spawn a skeleton, though you can change that to whatever, but first it checks if there's air for it to spawn and if you're spawning it on dirt, grass or sand, though you can take that check out if you wish

That works but it seems to spawn ghosts of the entity...

That works but it seems to spawn ghosts of the entity...

 

check if worldObj.isRemote is false when you're trying to spawn something.

Thanks, that worked!

tihs works but the mob usually gets suffocated because they appear on corners

tihs works but the mob usually gets suffocated because they appear on corners

 

Then adjust where it spawns