EasyBallistics JSON Import/Export Tool

Overview

The EasyBallistics JSON Import/Export Tool allows you to import and export bullet properties and material response configurations as JSON files. This is useful for:

Sharing ballistic configurations between projects
Backing up and versioning ballistic data
Batch editing configurations outside of Unreal Engine
Integration with external ballistics calculators

Accessing the Tool

In the Unreal Engine editor, go to Window > Ballistics JSON Import/Export
This will open the JSON Import/Export tool window

Features

Bullet Properties Export/Import

Export: Creates a JSON file with all mathematical bullet properties including:

Basic properties (grain weight, diameter, length, bullet type, material)
Ballistic coefficients (G1/G7)
Penetration properties (hardness, energy thresholds, expansion)

Import: Loads bullet properties from a JSON file and can create new bullet property assets

Material Response Export/Import

Export: Creates a JSON file with material response settings including:

Artistic properties (penetration, ricochet settings)
Spalling properties (fragment generation)
Mathematical material properties (density, hardness, strength values)

Import: Loads material response configurations from JSON files

JSON Format Examples

Bullet Properties JSON Structure

{
  "GrainWeight": 55.0,
  "DiameterInches": 0.224,
  "LengthInches": 0.825,
  "BulletType": 0,
  "BulletMaterial": 3,
  "BallisticCoefficientG1": 0.151,
  "BallisticCoefficientG7": 0.076,
  "UseG7Model": false,
  "SectionalDensity": 0.0,
  "BulletHardness": 15.0,
  "PenetrationEnergyThreshold": 58.0,
  "ExpansionVelocityThreshold": 1800.0,
  "MaxExpansionMultiplier": 1.5
}

Material Response JSON Structure

{
  "PenTraceType": 0,
  "NeverPenetrate": false,
  "PenetrationDepthMultiplier": 1.0,
  "PenetrationNormalization": 0.0,
  "PenetrationNormalizationGrazing": 0.0,
  "PenetrationEntryAngleSpread": 0.0,
  "PenetrationExitAngleSpread": 0.0,
  "NeverRicochet": false,
  "RicochetProbabilityMultiplier": 1.0,
  "RicochetRestitution": 0.5,
  "RicochetRestitutionInfluence": 0.0,
  "RicochetFriction": 0.5,
  "RicochetFrictionInfluence": 0.0,
  "RicochetSpread": 0.0,
  "EnableSpalling": false,
  "SpallVelocityThreshold": 50000.0,
  "SpallFragmentCount": 3,
  "SpallSpreadAngle": 45.0,
  "SpallVelocityMultiplier": 0.3,
  "SpallMassMultiplier": 0.1,
  "UseMathematicalProperties": false,
  "MathematicalProperties": {
    "DensityGPerCm3": 7.85,
    "MaterialHardness": 200.0,
    "TensileStrengthMPa": 400.0,
    "YieldStrengthMPa": 250.0,
    "ElasticModulusGPa": 200.0,
    "BallisticLimitVelocity": 2000.0,
    "PerforationCoefficient": 1.0,
    "EnergyAbsorptionCoefficient": 0.7,
    "EnableMathematicalSpalling": false,
    "SpallStrengthMPa": 150.0,
    "CriticalStressFactor": 2.5,
    "FragmentVelocityEfficiency": 0.25,
    "AverageFragmentMassRatio": 0.08,
    "FragmentSizeExponent": -1.6,
    "MaxFragmentDensity": 50.0
  }
}

Enum Values Reference

BulletType

0: Full Metal Jacket
1: Hollow Point
2: Soft Point
3: Armor Piercing
4: Armor Piercing Incendiary
5: Tracer
6: Match Grade
7: Frangible
8: Lead Round Nose
9: Wadcutter
10: Semi-Wadcutter
11: Custom

BulletMaterial

0: Lead
1: Lead-Antimony
2: Copper
3: Copper Jacket
4: Brass
5: Steel
6: Tungsten
7: Bismuth
8: Zinc
9: Custom

PenTraceType

0: Back Trace
1: By Component
2: Double Sided Geometry

Usage Tips

Backup Before Import: Always backup your existing assets before importing new configurations
Validation: The tool performs basic validation but always test imported configurations in your project
Version Control: Include JSON files in your version control system for configuration tracking
Batch Operations: You can modify multiple configurations by editing JSON files in bulk

Technical Notes

The tool uses Unreal Engine's JSON parsing system for reliability
All numeric values maintain their original precision
Boolean and enum values are preserved exactly
The tool supports the complete EasyBallistics property set

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