FixedMathSharp-Unity

A deterministic fixed-point math library for Unity and .NET, designed for lockstep simulation, multiplayer determinism, and floating-point-free precision.

This package is a Unity-specific implementation of the FixedMathSharp library

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🛠️ Key Features

• Fully Deterministic – Eliminates floating-point errors for lockstep simulations.
• Fixed-Point Arithmetic – Implements Fixed64 with high precision.
• Math & Trigonometry – Optimized FixedMath and FixedTrigonometry utilities.
• Vector & Matrix Support – Includes Vector2d, Vector3d, FixedQuaternion, and Fixed4x4.
• Bounding Volume Utilities – Use BoundingBox, BoundingSphere, and BoundingArea for collision checks.
• Unity Integration – Compatible with Unity’s Job System & Burst Compiler.

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🚀 Installation

Via Unity Package Manager (UPM)

1. Open Unity Package Manager (Window > Package Manager).
2. Click Add package from git URL....
3. Enter:

https://github.com/mrdav30/FixedMathSharp-Unity.git

Manual Import

1. Download the latest FixedMathSharp.unitypackage from the Releases.
2. In Unity, go to Assets > Import Package > Custom Package....
3. Select and import FixedMathSharp.unitypackage.

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📖 Usage Examples

Basic Arithmetic with Fixed64:

Fixed64 a = new Fixed64(1.5);
Fixed64 b = new Fixed64(2.5);
Fixed64 result = a + b;
Console.WriteLine(result); // Output: 4.0

Vector Operations:

Vector3d v1 = new Vector3d(1, 2, 3);
Vector3d v2 = new Vector3d(4, 5, 6);
Fixed64 dotProduct = Vector3d.Dot(v1, v2);
Console.WriteLine(dotProduct); // Output: 32

Quaternion Rotation:

FixedQuaternion rotation = FixedQuaternion.FromAxisAngle(Vector3d.Up, FixedMath.PiOver2); // 90 degrees around Y-axis
Vector3d point = new Vector3d(1, 0, 0);
Vector3d rotatedPoint = rotation.Rotate(point);
Console.WriteLine(rotatedPoint); // Output: (0, 0, -1)

Matrix Transformations:

Fixed4x4 matrix = Fixed4x4.Identity;
Vector3d position = new Vector3d(1, 2, 3);
matrix.SetTransform(position, Vector3d.One, FixedQuaternion.Identity);
Console.WriteLine(matrix);

Bounding Shapes and Intersection

BoundingBox box = new BoundingBox(new Vector3d(0, 0, 0), new Vector3d(5, 5, 5));
BoundingSphere sphere = new BoundingSphere(new Vector3d(3, 3, 3), new Fixed64(1));
bool intersects = box.Intersects(sphere);
Console.WriteLine(intersects); // Output: True

Trigonometry Example:

Fixed64 angle = FixedMath.PiOver4; // 45 degrees
Fixed64 sinValue = FixedTrigonometry.Sin(angle);
Console.WriteLine(sinValue); // Output: ~0.707

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🛠️ Compatibility

• .NET Framework: 4.7.2+
• Unity3D Version: 2022.3+
• Platforms: Windows, Linux, macOS, WebGL, Mobile

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📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

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👥 Contributors

• mrdav30 - Lead Developer
• Contributions are welcome! Feel free to submit pull requests or report issues.

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📧 Contact

For questions or support, reach out to mrdav30 via GitHub or open an issue in the repository.

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