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Developers' Diaries: Ground Forces Damage Model [Part 2]


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#1 QuarterNinja

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Posted 25 December 2013 - 05:49 PM

In the previous issue of the Tank Diaries we explained the basics of Damage Model for Ground Forces. Today we will tell you about the ammunition in War Thunder Ground Forces.

 
To make things more clear we will show how tank is damaged. We use special damage adjustment system.

Let us hit T-34 with a 75 mm KwK40 using cavity AP shell with PzGr39 balistic and protective cap from a short distance.
 

2.jpg


White line is shell’s motion vector (bottom left corner), yellow dot - a place where shell hit the armor, light blue lines - cone of armour shards. Tail fuse of the shell went off and the shel detonated approximately in the center of the fighting compartment. Yellow circle is HE damage radius, green sphere is fragmentation damage radius. Red traces from the center of the explosion - fragments that hit vital modules.

Also screenshot shows silhouettes of the significantly damaged modules - breech part of the gun and crew members(red boxes), turret ring engine and ammo rack - green boxes . Crew members were critically hit and are knocked out. Tank combat efficiency is significantly reduced but it is not yet destroyed since one of the crew members is still alive. Now let’s make a second shot.

Second shell also hit the front armour, penetrated it and exploded inside - tank is destroyed.
 

4.jpg


 
Ammunition

All existing ammunition is divided into following groups::

  • Armour-piercing kinetic-energy (including subcaliber)
  • High-explosive anti-tank
  • High-explosive fragmentation

Navesnoe%20oborudovaanie.jpg

Detachable equipment of PzKpfw IV Ausf.F2

Armour-piercing shells

All kinetic-energy armour piercing shells work on the same principle and the only difference is whether they have explosive or not (cavity shells - APHE/APHEBC/APCBC ) and their penetration value. All shells have similar pointed AP projectile construction.

In game it works the following way - each shell has characteristics that affect its trajectory (mass, initial speed, ballistic coefficient) and its killability (armour penetration scheme depending on distance, kinetic damage scheme depending on distance, separate characteristics of exposive’s killability ). When the target is hit several calculations are made :

  • breach check - if caliber is several times higher (10) than plate thickness it breaches the plate automatically.
  • if there is nobreach - bound check. Bound shot is possible if the angle is 30 degrees or less. The less the angle the higher is the chance of the bound. 0 degrees angle means 100% bound shot.
  • If there is no bound shot - then goes penetration check, following characteristics are taken into account - current penetration value, armour slope angle, and slope angle of the machine itself, angle of impact. Armour thickness is calculated and there goes a check whether a shell can or can not penetrate the armour.If not and the shell has explosives - it detonates and attachments can be damaged.
  • If there is penetration the shell deals the damage to the armor, loses penetration value and kinetic damage proportionally to armor thickness and goes further. Also each kinetic shell creates a shard cone that can damage modules and crew in the sector.

(for 76mm shell height of the cone is 2.5 m angle is 15 degrees, shard damage is enough to knock out a crew member on a single hit or partially damage internal modules).

The shell itself goes further and when hitting any internal module all above mentioned checks are made. Checks are made until penetration value of a shell is enough to penetrate a module or until the fuse goes off (if shell has explosives and armor was not thick enough to make it go off) A distance needed for the fuse is 0.5-1.5 m from the penetration point depending on caliber and type.

When fuse goes off the explosion follows which creates HE and fragmentary spheres of damage. Crew members and modules within the spheres may be damaged by shards and impact wave.

vystrel.jpg

Stug III Ausf.F shooting PzGr 39 shell

An important thing for players to know is that even a shell without explosives damage modules not like “laser beam” on its trajectory but also in some radius. Thus if AP shell hits a spot between a driver and radio operator secondary shards will most likely damage both crew members while the shell itself if it has enough penetration value may even reach the engine..

High-explosive anti-tank shells

These are fundamentally different from the armor-piercing shells. You can find out how the real ones work here. In game this kind of shells is simulated quite accurately: their armour penetration ability does not decrease with distance. Once the missile hits an obstacle an explosion is generated; its parameters are comparable to a fragmentation explosive shell of the same caliber allowing it to penetrate thin armour and damage the crew.

There is also a coherent jet formed at the point where the shell hit the target. Its effects are similar to those of a solid armor-piercing shell, striking all the modules on its trajectory and gradually losing some of its penetration ability with every module hit. The jet length is limited to a certain distance (usually 2 to 4 meters). Beyond this limit it is unable to deal any damage and dissipates quickly. Also the coherent jet generates a splinter cone with every impact, but it is much smaller compared to the conventional armor-piercing shells.

Fragmentation shells

This kind of ammunition is very similar to the aircraft carried bombs and rockets as well as automatic cannons’ HEF (high-explosive fragmentation) shells that are already present in the game. They generate spheres of explosive and splinter damage; if the numerical values of the blast wave strength are high enough, it penetrates the armour and deals damage. Medium and low caliber shells of this kind may destroy light vehicles with bullet-proof armour (like the Flakpanzer I anti-aircraft SPG). Higher caliber HEF shells (122mm upwards) are needed to destroy heavy and medium tanks.

 
Thus it is dramatically important to choose ammunition type according to its armour penetrating and explosive properties. Knowing and using advantages of different shell types against different opponents may turn the tide of battle

War Thunder developers team


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#2 LandsHeer

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Posted 25 December 2013 - 05:57 PM

looks nice, gimme access to it now so i can live it :D


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#3 MagicUnicorn

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Posted 25 December 2013 - 05:59 PM

Nice update Gaijin.

Also dat  Stug xxx.

 

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#4 TheFors

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Posted 25 December 2013 - 06:02 PM

So detailed... Waw. Gib nao.


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#5 Steelhide

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Posted 25 December 2013 - 06:02 PM

Love these. Thank you!


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#6 V4mpir3

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Posted 25 December 2013 - 06:05 PM

Good to see some more details, keep up the good work!
The more details we see the closer 2nd wave gets.


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#7 McDinggle

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Posted 25 December 2013 - 06:08 PM

Will the HEAP rounds cost us GE?


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#8 Unit757

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Posted 25 December 2013 - 06:11 PM

So tanks effective armor is just going to be LOS thickness against all guns then, and not the specific EA vs specific guns and shells?


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#9 Erich_Freimann

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Posted 25 December 2013 - 06:12 PM

Thanks for all these interesting details.

 

What about 2nd wave ?  :Ps


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#10 RoflSeal

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Posted 25 December 2013 - 06:18 PM

So tanks effective armor is just going to be LOS thickness against all guns then, and not the specific EA vs specific guns and shells?

I do hope devs are not going the lazy way of effective armor = (nominal thickness)/cos(angle)

 

 

All kinetic-energy armour piercing shells work on the same principle and the only difference is whether they have explosive or not (cavity shells - APHE/APHEBC/APCBC ) and their penetration value. All shells have similar pointed AP projectile construction.

 

Tungsten core KE shells are completely different for example.

 

And the Russian APBC/HE shell is blunt nosed (devs should know this lol)


Edited by RoflSeal, 25 December 2013 - 06:21 PM.

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#11 NightFury6189

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Posted 25 December 2013 - 06:18 PM

wow so detailed gib naow plz its so interesting!!


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#12 tomi7000

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Posted 25 December 2013 - 06:21 PM

Thanks for all these interesting details.

 

What about 2nd wave ?  :Ps

2nd wave next year not in december  

CBT advanced poorly.


Edited by tomi7000, 25 December 2013 - 06:23 PM.

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#13 Jmigfer7

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Posted 25 December 2013 - 06:21 PM

Love these developers' diaries.


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#14 Stona

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Posted 25 December 2013 - 06:21 PM

Will the HEAP rounds cost us GE?

 

There is no such thing as ammo for GE


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#15 mike113

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Posted 25 December 2013 - 06:21 PM

Wow. cool. I want more news and I don't want to play just more news please more reading and no playing yes epic awesomeness.


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#16 galeozac

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Posted 25 December 2013 - 06:22 PM

stop blabla 

 

31 decembre 0h00 = paiement player (remboursement)


Edited by galeozac, 25 December 2013 - 06:23 PM.

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#17 xCrimson_Thunder

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Posted 25 December 2013 - 06:22 PM

Wait a minute....

 

"Crew members were critically hit and are knocked out. Tank combat efficiency is significantly reduced but it is not yet destroyed since one of the crew members is still alive. Now let’s make a second shot."

 

What does that mean? That we will be able to drive the tank and use the gun, but with reduced efficiency?   Or that it simply isn't destroyed but out of action? That's the same as destroyed isn't it? I mean, when the PILOT of the airplane gets killed, isn't it considered as "DESTROYED"?


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#18 ImaginaryStar

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Posted 25 December 2013 - 06:24 PM

Impressive.

Much more than I expected...


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#19 Erich_Freimann

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Posted 25 December 2013 - 06:24 PM

2nd wave next year not in december  

CBT advanced poorly.

 

Source ?


Edited by Georg_Diers, 25 December 2013 - 06:25 PM.

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#20 PanzerFuchs

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Posted 25 December 2013 - 06:26 PM

Will there be visible dents/holes in armour on the spot where a shell failed to penetrate/penetrated?


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