On my server, I have just begun playing with eggs and mob mounts. It seems that if you want to spawn a certain thing, you can type in /i 383:[id]. The ID for a creeper, for example, is 50, so doing /i 383:50 would give you a creeper egg. These ids are called network IDs, if I read correctly. This is how people can get things suck as golem eggs. I was wondering if there was a list off all network IDs; a list of IDs that can be added as a suffix to 383. I've been playing around with /spawnmob and doing /spawnmob pig,villager 1 creates a villager riding atop a pig. Do combinations have their own IDs so that I may make a pig jockey egg? Is there a formula to get the network ID of a mount? If so, please say so. There should be a way. And if there is, that would mean I could do /i 383:[pig-villager id combo] and get an egg which spawns pig jockeys. If anyone has a list of network IDs or an answer to any of my questions, please reply. Sorry if it is a bit complex.
I don't think there's a way in vanilla, but I think you could do this with a plugin for bukkit or a mod.
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The Darkness will win one day, and light's time being the winner is nearing it's end. Because light is overrated.
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My heavily work in progress Minecraft Modding API and mod loader, N-API: https://github.com/Niadel/N-API
Code changes from 1.7 to 1.8 for us modders (that I found): https://gist.github.com/Niadel/2d2db8dd89de27f970a7