I liked the Nausicaa of the Valley of the Wind movie so I read the manga and I've been playing hexxit recently. The two things have kind of glomped together in my head and I've been wanting to start making a mod set in that universe. I only have coding experience in C and C++ but I've been watching forge modding tutorials where they use eclipse. It doesn't look like it will be too hard to retrofit my previous knowledge but I doubt I could finish all the ideas I have in less than a year (I'm in college so not much time). So I'm setting my sights on just getting a cool looking "forest of decay" biome in minecraft. Before I dive into this I thought I'd see how reasonable you guys and gals think my ideas are.
Okay first question. Would it be possible to generate a layer of trees and then generate another layer of trees on top of that? The third panel of this page is a good illustration of what result I'm trying to get. (maybe not so tall for the vaults) Is it possible for the "forest of decay" biome to have a strip of custom biome around it's perimeter? The petrified trees can't be right up on the edge of the forest because it takes hundreds of years for them to develop. So I want to make a transition area where there aren't any of the petrified trees. Or they could be so short the branches reach to the ground so you can't see under the "leaves"(the petrified trees would have like a mycelium dirt block for leaves).
The only way I could think to implement the miasma (It's only supposed to be in the forest and above it a little ways but !spoiler! doesn't extend into the foundation trees) Would be to make the corrupted trees have leaves or fruit be a source block for a custom "liquid" that behaves like a gas and poisons you if you don't have a mask on.
Is there another way to make a poison or similar effect apply to the player if they're at a certain elevation, in the biome, and are not wearing a gas mask? I don't know how I'm going to implement gas masks either but I was going to see if the guy from gas craft might help me out with that. When I figure out how I want to implement the gasses.
Would it be possible to make a large Ohmu mob? They break through trees and stuff to get where they're going so coding them wouldn't require trying to fit a large mob through small spaces. I haven't seen many good examples of massive mobs in minecraft so I get the feeling it's not so easy to do well. It might end up being easier to just find their molted husks occasionally as a source of Ohm shell. Here's a reference picture of a live one and an empty husk. (I think this is an exceptionally large one so I think I would make them at most half that size.)
Also would it be possible to have non lethal weapons that make a hostile mob no longer hostile? So like would you be able to make a splash potion like object (flash grenade) that would turn a zombie pigman back into passive mode? The Ohmu should have the same behavior as them. An object like this would be the easiest way to stop a rampaging ohmu. In the series Ohmus have chitin that is more impervious than composite ceramic and metal matrices. So going at it with a bow and arrow should take a while.Yeah I'm starting to think just finding the molted husks would be easier to code and less op. The forest will at least have some other regular sized creatures to fight.Oh, speaking of.
Could different types of forest mobs all respond to one being attacked? That's kind of an important aspect of the forest. If this isn't possible I don't know if it would be better to have them all be aggressive or have each species become separately aggressive when attacked.
Well, I don't really know Java and I have to say, I wouldn't try most of your ideas without learning it.
1. Petrified trees probably don't behave like other trees, so I would create tree-like structures from any material and then put trees growing on that material on top of it. Apart from that, you could create trees growing on petrified leaves, so you could as well have two layers.
2. Biome edges already exist. -> Beach Biomes
3. For the gas, I don't know, probably you should create an air similar block for that.
4. For you whatever, the Wither is a good referance, as it's tall, armored and can destroy blocks.
5. You should have a super class with the agressiveness and then child classes.
Personally, I think you do like everything if you're good enough at Java.
Oh my god man, I have been searching google for weeks looking for exactly this, so glad someone has on interest in making this a thing still! I don't have much experience in coding but I can say that Eclipse is super easy to use and you should catch onto it quickly. A tall forest underneath an earthen layer with the new forest on top of that would be amazing and it's something I have longed for since I first saw Nausicaa while MInecraft was still in BETA. I would love to help you with this project if you get the answers you are looking for, though I would have to assist in non-coding efforts since I only share a gigantic interest in the topic and recreating the Nausicaa universe inside of Minecraft.
HAHA I was to excited to see this post to give you my idea's regarding your questions. First, regarding the Ohmu mob, are you aware of the tornado mod? Look it up because this mod creates a similar type of damage the Ohmu also would cause, remove the tornado and sky effect and replace with a giant mob like already exists in giant zombies and you basically have what you are looking for.
In terms of mobs that react to one of their own or allies being attacked, take a look at the mod the recreates the chicken attack from the Legend of Zelda; Ocarina of Time. If you haven't heard of that mod already, when a chicken is attack a number of times, dozens more chickens are summoned to retaliate. This is basically the result you are looking for but you would have to change the additional summoned chicken to mobs already present in the area.
I can't provide examples for the other questions but they all seem very much feasible!