Sphere

src/PolyZone.Tests/Shapes/CircleTests.cs

@@ -9,7 +9,7 @@ public class CircleTests
     [Fact]
     public void CircleA()
     {
-        var circle = new Circle(-7.7f, -3.55f, 5f);
+        var circle = new Circle(new Vector2 { X = -7.7f, Y = -3.55f }, 5f);
 
         var insidePoints = new[]
         {

src/PolyZone/Shapes/Interfaces/ISphere.cs

@@ -0,0 +1,6 @@
+namespace PolyZone.Shapes.Interfaces;
+
+/// <summary>
+/// A 3d spherical shape
+/// </summary>
+public interface ISphere : ISpatial3dShape;

src/PolyZone/Shapes/Sphere.cs

@@ -0,0 +1,26 @@
+using CitizenFX.Core;
+using PolyZone.Shapes.Interfaces;
+
+namespace PolyZone.Shapes;
+
+/// <summary>
+/// A 3d sphere constructed from a center 3d point and a radius
+/// </summary>
+/// <param name="center">Center of the sphere</param>
+/// <param name="radius">Radius of the sphere</param>
+public class Sphere(in Vector3 center, float radius) : ISphere
+{
+    public Vector3 Center { get; } = center;
+    public float Radius { get; } = radius;
+
+    /// <inheritdoc cref="ISpatial3dShape.Contains"/>
+    public bool Contains(in Vector3 point)
+    {
+        // Calculate the distance from the center of the sphere to the given point
+        var distance = (float) Math.Sqrt(Math.Pow(point.X - Center.X, 2) + Math.Pow(point.Y - Center.Y, 2) + Math.Pow(point.Z - Center.Z, 2));
+
+        // Check if the distance is less than or equal to the radius
+        return distance <= Radius;
+
+    }
+}