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HOI4 Dev Diary - Acclimatization and Special Forces

Hi everyone and welcome to another dev diary where we show off stuff as we work on Waking the Tiger. Today we are going to be talking about a feature I’ve been wanting for a long time - troop acclimatization.


Acclimatization
We have long wanted to simulate the problems associated with shifting troops to new fronts with more extreme weather they are not used to. We currently have two types: Cold Acclimatization and Heat Acclimatization. It is not possible to be acclimatized to both at the same time, so if you take troops from the desert and put them down in the Russian winter, they will need to “work off” their heat acclimatization first before they start getting accustomed to the cold. When a division is sufficiently acclimatized, it will change its look, as you can see below. On the left are troops in winter with no acclimatization and on the right is what they will look when acclimatized.
Screenshot_1.jpg

And an example from Africa:
hoi4_4.jpg


For most countries, we do this by switching the uniform on the 3D model to use more appropriate textures. In some cases, like where people only had tropic uniforms with short pants and the like, we replaced their uniforms to be more winter appropriate (suggestions by the art department to simply color their knees blue were sadly rejected). The new textures come with the DLC, but the core mechanic is free as part of 1.5 Cornflakes. You can see your acclimatization status as part of the unit list and its effects:
Screenshot_2.jpg



With full acclimatization you will reduce extreme weather penalties by about half. We will also be increasing the impact of harsh weather a bit to compensate for being able to avoid it now.

There are a few things that will help you gain acclimatization also. If your commander has the Adaptable trait or Winter Expert it will speed things up. There are also technologies that influence the acclimatization speed (more on that later).
upload_2017-12-6_14-41-16.png



Special forces
Up till now, we have had a bit of a balance issue with Special Forces (Marines, Mountaineers, Paratroopers). They were, pound for pound, better than regular infantry and many people simply replaced all their infantry with mountaineers.

To make sure special forces stay special, we added a restriction based on your whole army:
Screenshot_3.jpg


To ensure that you always know how many special forces you can field, the division designer and deployment will help you keep track:

Screenshot_4.jpg


Along with this change in how Special Forces work, we wanted to make them stand out a bit more. Six new infantry technologies have been added to improve these elite troops.

Special forces are trained and equipped for conditions that ordinary soldiers aren’t expected to excel in. The first tech will give them a boost to acclimatization speed. Afterwards, the tree splits. One option is to train your special forces harder, to improve their skills and their ability to fight for longer before having to be resupplied. The other option is to expand the special forces training programs to accept more recruits. Your special forces will be more numerous, but come with more drag and not quite as high speed. In the end though, they will still be elite forces and will be able to develop training to make them even more skilled in fighting in the harshest of conditions.

Screenshot_5.jpg


See you all next week when we return to take a look at the Chinese warlords.

Also, don’t miss out on World War Wednesday today at 16:00 CET as normal. Me and Daniel will continue our fight against communism (or the British fleet… we are still arguing about that) as Germany under the rule of the Kaiser.
 
The target is something like 6 months (longer, so something like 8 if fully desert acclimatized) for full acclimatize. but it depends how bad weather is and if you are fighting or doing nothing. In really bad weather and fightign it will go fastest.
So 2 Russia winters? That does seem a bit long.

If a German unit was sent to North Africa at the start (March 1941) and was still around at the end (May 43) it would take about 1/3 of the campaign to get acclimatized? I would set a 3 months as standard target time. Last through one Russian Winter be ready for the next.



Also when a Cold Acclimatized unit is in normal (summer weather, not harsh deserts) weather on say the Russian Front will they keep there 'Winter' look?
 
Nice addition! it will enhance the immersion, and that's always good :) Can't wait for this and the name list on that part!
And nice to see that special forces will remain special too, that's a nice tweak.

One question though, do you get the bonus from acclimatization by fighting or simply by staying in a cold/hot area? Which is, I think, quite different in reality...

Edit: Ok, did not see the answer in former posts!
 
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Am I correct in saying that with acclimatization plus the new events system, that modders can historically recreate the disastrous Russian winter (no winter clothing) following Barbarossa?
Possibly, depending on exactly how this kind of stuff can be modded, but in vanilla I don't think this is the case... if anything, it looks like it might actually strengthen SOV, as they will have plenty of time to acclimatize right across Russia and the Eastern Front, whereas GER won't.

The only way this can really help GER is if they are able to make solid progress early on, grind to a halt, and then dig in -- however, the same bonuses will also apply to SOV, and so really it's a net gain for them, and they also have the advantage of being able to bring in more divisions that are already acclimatized (because so much of Russia will have these cold weather modifiers).

However, I echo @JerkyJerry's worries about the AI, because unless something miraculous has been done behind the scenes over the previous few months, I really don't see how it can be able to comprehend these modifiers, let alone use them to its advantage. Always happy to be proven wrong, of course, and I do recall hearing that Paradox had hired additional AI coders. We'll see.
 
Will acclimatisation "stick" to units who leave that area? Could you, for example, acclimatise some British regular divisions in the Scottish Highlands and then ship them over to Norway to fight off the likely German invasion?
 
we are speaking about a +10% or +5% to attrition :D we are anyway speaking about nuts... LOL... where are the TRUE big enhancements capable to give this game more actionability, realism and competitiveness?
 
... I echo @JerkyJerry's worries about the AI, because unless something miraculous has been done behind the scenes over the previous few months, I really don't see how it can be able to comprehend these modifiers, let alone use them to its advantage. Always happy to be proven wrong, of course, and I do recall hearing that Paradox had hired additional AI coders. We'll see.
Does acclimatization require any particularly complex tactics though? Just making the ai not shuffle troops between cold and hot theaters, and being less aggressive with un-acclimated troops, would probably serve the ai just fine, and since, unlike a player, the ai will know as soon as troops acclimate, this complexity might help the ai rather than hurt it.
 
Across a large front troops could be hot at one end and cold at the other. With the AI so prone to shuffling troops all over the place across a large front how does the AI take acclimatized troops into account? Will it shuffle hot into cold and vice versa without a care and cause problems (males) for troops not properly acclimatized? Will it keep shuffling so much that nobody gets acclimatized?
 
I like these ideas, but I think you need to put in some national ideas for some countries to raise numbers. E.g. USA should be able to field more special forces. Else you will make dday nearly impossible in MP
 
Will acclimatisation "stick" to units who leave that area? Could you, for example, acclimatise some British regular divisions in the Scottish Highlands and then ship them over to Norway to fight off the likely German invasion?
If you look closely at the tooltip in the screenshot in the OP, the acclimatisation is based not on which region the unit is in, but on what climate it is experiencing, so shipping units from one region with a harsh climate to a different region with the same harsh climate is not going to affect the acclimatisation.
 
We can expect national focus to improve the cap (or the efficiency) for nation with a tradition with some special forces like Mountaineers and Marines? There are nation that for the fact the have important mountain range or an history with some kind of wars, have a strong presence of these type of units in their armies.
 
While you are tinkering with the template designer, can we rename “support companies” to support battalions please.
 
Hmmm will this be out right after Christmas?
 
oh I probably should have explained that more. Its visible in one of the screenshots with the tooltip. Being in the area with those effects will see you gain acclimatization. If you are actively fighting it however goes much faster
Does training in Hot/Cold zone also speed things up?
 
I'm not feeling it at all. I just don't think my style of play lends itself to using these additions very often. To me thus far as I understand unless I'm rushing troops from the desert into a blizzard I'm going to have to wait "X" amount of time before they are 100% to fight? Um, ok. For how many countries? Germany &?
I don't know, it just seems to me this will be a seldom if ever used feature and when it is used it boils down to a time delay to wait for new uniforms to arrive? Again realistic but how often will it ever be a real factor of any type?

What deserts are we talking about here?
How much is this going to further handicap the AI? Is it going to be able to recognize any of this? How much front shifting will be going on because of it?

I see this as an option that will be exercised very rarely.

I disagree. It further prioritizes and emphasizes planning pre-war. it makes sense now to wait until 6 months (or whatever the time is) before planning on attacking Egypt as Italy, and then positioning all the troops you plan on using into Libya. that way you may have a decisive advantage in acclimatized troops over the Brits in the first few months of the war as they have to shift units from elsewhere.
 
I disagree with limiting the special forces battalions, at least by how much it's limited. 24 battalions is like 2 divisions... if they're 7-2s... if they're 14-4s or bigger it's one.... In MP this will be a massive problem because if you can only have a couple marine divisions at best then d-day becomes enormously harder, actually all naval invasions will become enourmously harder because at best you can have like a max of 10 marines because 5% of 2000 battalions (which is a shit ton) is not even 8 full 14-4 marines. Instead of seeing a weather acclimiation research path I would have liked to see more special forces (like Jungle or desert) but that isn't what really upsets me a lot. Paradox I recommend you have increase the amount of special forces signifigantly from 5% of the total battalions. Having only 7 divisions of marines when you have 2000 infantry battalions is cruddy.
 
We can expect national focus to improve the cap (or the efficiency) for nation with a tradition with some special forces like Mountaineers and Marines? There are nation that for the fact the have important mountain range or an history with some kind of wars, have a strong presence of these type of units in their armies.

Let's say this was done: A problem arises in that giving each nation a pre-assigned number or idea is fraught with inaccuracies and a bit artificial.

In your case I think it'd be easier to just dynamically assign "mountain tradition" based on the number or percentage of core mountain (lesser hills) provinces you own. "Marine tradition" would come from number of overseas coastal provinces and navy size. Land-locked Switzerland won't be making strong marines, but they could have strong mountaineers. Overseas empires like the U.K. and Japan would be excellent choices for fielding marines naturally.