feat: add generator for holed plane

Assets/Scripts/MeshGenerator/HoledPlaneGenerator.cs

+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+public class HoledPlaneGenerator : ShapeGenerator
+{
+    #region InspectorVariables
+    [Header("Plane values")]
+    public Vector2 planeSize = new(100, 100);
+    public Vector2 holeLocation = new(50, 50);
+    public float holeRadius = 1f;
+
+    [Header("Technical")]
+    [Range(4, 1000, order = 4)] public int holeSideCount = 500;
+
+    [Header("Parts")]
+    public MeshFilter planeMesh;
+    #endregion InspectorVariables
+
+    #region Implementation
+    protected override void GenerateShape()
+    {
+        AssignMesh(planeMesh, CreateHoledPlane(planeSize, holeLocation, holeRadius, holeSideCount));
+    }
+
+    private static (Vector3[] vertices, int[] triangles) CreateHoledPlane(Vector2 planeSize, Vector2 holeLocation, float holeRadius, int holeSideCount)
+    {
+        var corners = new Vector3[4] { 
+            new Vector3( planeSize.x/2, 0,  planeSize.y/2), 
+            new Vector3( planeSize.x/2, 0, -planeSize.y/2), 
+            new Vector3(-planeSize.x/2, 0, -planeSize.y/2), 
+            new Vector3(-planeSize.x/2, 0,  planeSize.y/2) };
+        var circlePoints = GetCirclePoints(holeRadius, holeSideCount, new Vector3(holeLocation.x, 0, holeLocation.y));
+        Vector3[] vertices = circlePoints.Union(corners).ToArray();
+
+        int[] triangles = new int[vertices.Length * 3];
+        int cpCount = circlePoints.Length;
+        int quarter = Mathf.FloorToInt((float)cpCount / 4);
+        int rest = cpCount % 4;
+
+        int start = 0;
+        for (int corner = 0; corner < 4; corner++)
+        {
+            int cornerIdx = cpCount + corner;
+            int end = start + (rest-- > 0 ? quarter + 1 : quarter);
+            for (int i = start; i < end; i++)
+            {
+                triangles[i * 3 + 0] = (i + 1) % cpCount;
+                triangles[i * 3 + 1] = i;
+                triangles[i * 3 + 2] = cornerIdx;
+            }
+            triangles[triangles.Length - ((corner+1)*3) + 0] = end % cpCount;
+            triangles[triangles.Length - ((corner+1)*3) + 1] = cornerIdx;
+            triangles[triangles.Length - ((corner+1)*3) + 2] = cpCount + (corner + 1) % 4;
+
+            start = end;
+        }
+
+
+        return (vertices, triangles);
+    }
+    #endregion Implementation
+}
\ No newline at end of file

Assets/Scripts/MeshGenerator/HoledPlaneGenerator.cs.meta

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