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108 lines
3.7 KiB
Markdown
108 lines
3.7 KiB
Markdown
---
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layout: wiki
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title: Advanced Ballistics
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description: The advanced ballistics module improves internal and external ballistics.
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group: feature
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category: realism
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parent: wiki
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---
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## 1. Overview
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The Advanced Ballistics module improves internal and external ballistics.
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## 1.1 Features
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- Drag modelling based on real-world ballistic coefficients.
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- Ambient air density (air pressure, temperature, humidity) affects drag.
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- Wind affects drag and deflects the trajectory.
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- Wind speed varies with altitude.
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- Terrain features, buildings and other objects disrupt the wind.
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- [Magnus effect](https://en.wikipedia.org/wiki/Magnus_effect) (spin drift)
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- [Coriolis effect](https://en.wikipedia.org/wiki/Coriolis_effect) and [Eötvös effect](https://en.wikipedia.org/wiki/Eotvos_effect) (Earth rotation)
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- Loss of stability during transonic flight.
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- Variable muzzle velocity based on powder burn rate and barrel length.
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- Bullet trace effect for supersonic bullets (light refraction due to air pressure waves).
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- A protractor for quickly measuring the inclination angle.
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## 2. Usage
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### 2.1 Protractor
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Press <kbd>Ctrl</kbd>+<kbd>⇧ Shift</kbd>+<kbd>K</kbd> while using a compatible weapon to toggle the protractor. The red line indicates the current inclination angle in degrees. The protractor will disappear if you lower or holster your weapon.
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## 3. Dependencies
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`ace_ballistics`, `ace_weather`, `ace_modules`
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## 4. Addon Configs:
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Reference https://github.com/acemod/ACE3/blob/master/extras/CfgAmmoReference.hpp for examples of bullets with correct configs.
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It is probably best to modify an example that's close to the bullet you are trying to add.
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<div class="panel callout">
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<h5>ALL VALUES ARE IN METRIC</h5>
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</div>
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### 4.1 CfgWeapons (Example M4):
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- `ACE_barrelTwist=177.8;`
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>1:7 inch rifle twist
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7 inches * 25.4(mm/in) = 177.8 mm
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Same as the Capital T in https://en.wikipedia.org/wiki/Miller_twist_rule (convert to metric)
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- `ACE_barrelLength = 368.3;`
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>14.5 in (370 mm)
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Self explanatory
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- `ACE_twistDirection`
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Right handed is 1, Left is -1, none is 0
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Leaving blank will default to 1 (Almost everything is right-handed)
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A smooth-bore gun (e.g. shotgun) would be `0`.
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### 4.2 CfgAmmo (Example B_556x45_Ball):
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- `ACE_caliber=5.69;`
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Bullet diameter in mm (diameter is a little different from caliber)
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- `ACE_bulletLength=23.012;`
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Bullet Length in mm
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- `ACE_bulletMass=4.0176;`
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Mass in grams (example is roughly 62 grains)
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- `ACE_ammoTempMuzzleVelocityShifts[]={-27.20, -26.44, -23.76, -21.00, -17.54, -13.10, -7.95, -1.62, 6.24, 15.48, 27.75};`
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Array of muzzle velocity shifts in m/s with 11 data points from -15 °C to 35 °C
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Example: At 0°C the shift will be -21.0
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- `ACE_ballisticCoefficients[]={0.151};`
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Array of ballistic coefficients (contains one element more than the velocity boundary array)
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- `ACE_velocityBoundaries[]={};`
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Array of velocity boundaries
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- `ACE_standardAtmosphere="ASM";`
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"ASM" or "ICAO"
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- `ACE_dragModel=7;`
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Number that specifies the drag model [1, 2, 5, 6, 7, 8]
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- `ACE_muzzleVelocities[]={723, 764, 796, 825, 843, 866, 878, 892, 906, 915, 922, 900};`
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Array of muzzle velocities (same size as barrel length array)
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- `ACE_barrelLengths[]={210.82, 238.76, 269.24, 299.72, 330.2, 360.68, 391.16, 419.1, 449.58, 480.06, 508.0, 609.6};`
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Array of barrel lengths (same size as muzzle velocity array)
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Example, when shooting with the M4 barrel (`368.3`mm).
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The length is between the 5th and 6th barrelLengths (`360.68, 391.16`).
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So the muzzle velocity will be between 5th and 6th muzzleVelocities (`866, 878`).
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## 5. Dependencies
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{% include dependencies_list.md component="advanced_ballistics" %}
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