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Arma 3 Tanks Config Guidelines

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Intro编辑

101 - How to set up a tank for Arma 3

Please be aware of our Arma 3 modding license: http://community.bistudio.com/wiki/Arma_3_Modding_License

General Config References apply (A2 and A3), the most important ones: CfgVehicles and Turrets class

Comparison to A2/OA tanks 编辑

  • PhysX support
  • Improved penetration materials
  • More detailed Fire Geometry LODs
  • Improved tweakability of HitPoints LODs


Comparison TankX vs. CarX 编辑

Arma_3_Cars_Config_Guidelines

  • More wheels to be set up
  • Few additional params used
  • Less complicated Center of Mass tweaking
  • Vehicle config parameter: tankTurnForce
  • Wheel config parameter: side
  • Importance of wheel config parameters: MOI, dampingRate, dampingRateInAir


Model requirements {p3d} 编辑

  • A new PhysX LOD
    File:Test Tank 01 Geometry PhysX LOD.jpg
    • There needs to be a lod (4e13) consisting of convex components as simple as possible.
      • Current public Oxygen version doesn't support showing correct name of this lod and displays only Geometry instead. Don't be afraid of having two geometries, it's going to be fixed with new tools.
    • This lod should contain tank’s hull, turret and main gun only. Wheels representing the tracks are added by engine later
  • Memory LOD
    File:Test Tank 01 Memory LOD PhysX Wheels.jpg
    • There should be an axis for each wheel named wheel_X_Y_axis (X is 1 for left and 2 for right, Y is position of wheel from front), the name is defined in selected wheel as center.
    • There should be a point at the edge of each wheel named wheel_X_Y_bound which is used to determine wheel radius (distance from wheel axis is used for this) - there is no other need than placing the point at the edge, even memory points for tracks could be used for this, the name is defined in selected wheel as boundary

Model config changes {model.cfg} 编辑

  • Similarly to PhysX related car changes, you will mostly need to change dampers:
    • Example:
 		{model.cfg}
 			class Wheel_podkoloL1 {
 				type = "translation";
 				source = "damper";
 				selection = "podkoloL1";
 				axis = "damper_axis"; // contains points [0,0,0] and [0,0,1]
 				animPeriod = 1;
 				minValue = 0;
 				maxValue = 1;
 				offset0 = 0.15; // = maxCompression
 				offset1 = -0.15; // = maxDroop
 				memory = 1;
 			};
    • Man-held turrets like commander’s gun on T-72 shouldn't be hidden until whole vehicle is destroyed - IK issues would crash the game


New config parameters {config.cpp} 编辑

Basic parameters编辑

TankX uses most of the parameters present in cars. The tutorial will comment only parameters not described in car tutorial.

  • <Type>: string
  • <Default>: (required)
  • simulation = "tankx";

Engine parameters编辑

  • <Type>: float
  • <Default>: (required)
  • tankTurnForce = 330000; // start from 11x vehicle mass and tweak until fine'

Wheel parameters编辑

Wheels work almost like in cars. PhysX allows up to 20 wheels (10 per side) at maximum. Wheels are not steerable, and all left wheels have to be in one line, and right wheels have to be in one line as well. They should also be the exact same size, otherwise you may encounter servere problems, as all wheels will be forced to have the same rotation speed. This can prevent your tank from driving any faster then 10km/h. Exceptions may be made for wheels that do not always touch the ground, but should be done with caution. Special wheels, like the drive sprocket and idler wheels don't have suspension on realworld tanks - set both maxDroop and maxCompression for them to 0. Drive sprocket and idler wheels are not required to make a working tank with PhysX however. Only implement wheels that are important for ground contact. e.g. If a Tank's body would collide with the ground before the sprocket wheel touches it, don't include the wheel. It would be useless for the game, while eating valuable computing ressources and adding to the things you need to configure.

Wheel PX parameters编辑

  • steering = 0; - tank wheels are not turning
  • side = “left”; - which side of tank the wheel belongs to
  • dampingRate = 0.1; - damping rate while contacting with ground
  • dampingRateInAir = 8000; - damping rate while in air. Use to tweak maximum speed. Tweak together with MOI.
  • MOI = 50; - moment of inertia, set it so the tank does not accelerate or maintain speed indefinitely. Tweak together with dampingRateInAir.

Suspension parameters编辑

  • maxCompression = 0.15; // set to 0 for wheels that don’t have dampers
  • maxDroop = 0.15;// set to 0 for wheels that don’t have dampers

Damage handling编辑

Tanks offer differing protection levels for themselves and crew inside, depending on place you hit them. Balancing damage is usually most time-consuming task for armored vehicles.

Basic config编辑

The tanks will usually have - at first sight - too much armor. But their vulnerable hitpoints will justify the effort, making it possible to destroy or neutralize armor with one shot.

Use armor to represent overall thickness of vehicle as seen by AI units, and armorStructural to finetune damage received.

Armour plates setup编辑

Armour plates consist of convex components in Fire Geometry.

File:Test Tank 01 Fire Geometry LOD.jpg

Surface A3\Data_F\Penetration\armour.rvmat provides Rolled Homogenous Armour (RHA) equivalent in Arma world. For best results, create convex components with armour plates offering desired Line of Sight thicknesses. Refer to http://en.wikipedia.org/wiki/Sloped_armour for more details about real life side of the issue.

For example, T-72’s front armour should have protection level of 550mm RHA horizontally. As you can see in example model, the plate itself is much thinner. Due to sloping it can withstand penetration up to 550mm RHA.

You may also use armourplate materials on components. These have a predefined thickness, regardless of the shape or thickness of the convex component. The difference between a plate and a regular material is, that a penetrator does not go into a plate component if it can't be totally penetrated. Against a regular material, the penetrator would enter the block, but be stopped somewhere inside the component if the pentration isn't enough. The plate materials can be used for small components that otherwise are difficult to model. Examples of plate materials would be armour_plate.rvmat (30mm RHA), armour_plate_medium (80mm RHA, armour_plate_heavy (110mm RHA) and armour_plate_16mm (16mm RHA). Just beware that components using such surface material will NOT stop projectiles after penetration.

All the materials available for penetration can be found in A3\Data_F\Penetration (respectively <Arma3installation>\Addons\data_f.pbo\penetration). You can also create and use custom penetration materials.

You may also need a metalplate component inside free space inside, to catch bullets that otherwise shouldn’t even pass primary armour but for whatever reason (f.e. sticking gun’s muzzle into tank) it’s possible to bypass primary armour.

For more detail on how the damage works, check A3 Damage Description.

Hitpoints编辑

Hitpoints represent weak points in structure of tanks: turret servos, ammo storages, engine. They can also improve internal penetration handling.

Hitpoint categories编辑

There are 3 common hitpoint categories in Arma 3's tracked vehicles:
File:Test Tank 01 Hit Points LOD.jpg
  • HitHull, handling internal penetration - when damaged over 0.9, vehicle will explode.
  • HitEngine, handling damage of engine
  • HitLTrack, HitRTrack, damage of tracks/drive sprockets/idlers

Turrets have their own class HitPoints, coontaining info about how easy it is to damage given turret:

  • HitTurret, horizontal rotation
  • HitGun, vertical rotation - this should handle any event that renders tank guns inoperable, f.e. hit to servos

New attributes编辑

Hitpoints gained two important config attributes in Arma 3:

  • radius, defining size of “hitpoint sphere” around each vertice in Hit Points LOD assigned to given hitpoint’s selection
  • explosionShielding, multiplying damage inflicted by indirect damage. The smaller it is, the less damage hitpoint will receive.

Internal damage编辑

Internal damage is handled by HitHull class. When KE round penetrates the armor plates, it passes the damage to HitHull hitpoints array as seen in example model. The hitpoint vertices are set up in such way that the nearest distance between them equals RADIUS attribute in HitHull class, and they cannot be activated by rounds that fail to penetrate armor.
File:Test Tank 01 HitHull vertices vs. Fire Geometry LOD.jpg

During implementation of internal damage handling it is important to tweak following attributes:

  • armor
  • explosionShielding
  • radius

If the results of config tweaking are not satisfying, consider adding greater detail to Hit Points and Fire Geometry LODs.

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