*

Assets/Scenes/CircleSurface.cs

@@ -0,0 +1,44 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class CircleSurface : OpticalSurface2D
+{
+
+    public float Radius;
+    public int ViewSamples = 15;
+
+    void Start()
+    {
+        
+    }
+
+    void Update()
+    {
+        
+    }
+
+    private void OnValidate() {
+        Shape = PointsToLines(GetGeometry(), true);
+    }
+
+    private Vector2[] GetGeometry() {
+        Vector2[] result = new Vector2[ViewSamples];
+        float da = Mathf.PI * 2 / ViewSamples;
+        for (int i = 0; i < ViewSamples; i++) {
+            float angle = da * i;
+            result[i] = new Vector2(Mathf.Cos(angle) * Radius, Mathf.Sin(angle) * Radius);
+        }
+        return result;
+    }
+
+    public override bool Raycast(Ray2D ray, ref RaycastMath.RaycastResult2D result) {
+        var localSpaceRay = new Ray2D( transform.InverseTransformPoint(ray.origin), transform.InverseTransformVector(ray.direction).normalized);
+        if (RaycastMath.RaycastCircle(localSpaceRay, Radius, ref result)) {
+            result.Point = transform.TransformPoint(result.Point);
+            result.Normal = transform.worldToLocalMatrix.MultiplyVector(result.Normal).normalized;
+            return true;
+        }
+        return false;
+    }
+}