chore: initial commit

Assets/Feel/MMTools/Accessories/Editor/MMCollisions/MMMeshToPolygonCollider2D.cs

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+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEditor;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+
+namespace MoreMountains.Tools
+{
+	/// <summary>
+	/// A class that lets you create polygon collider 2D out of mesh filters
+	/// </summary>
+	public class MMMeshToPolygonCollider2D : MonoBehaviour
+	{
+		/// <summary>
+		/// Generates a PolygonCollider2D out of a meshfilter
+		/// </summary>
+		/// <param name="meshFilter"></param>
+		private static void GeneratePolygonCollider2D(MeshFilter meshFilter)
+		{
+			// we validate our mesh
+			if (!ValidateMesh(meshFilter))
+			{
+				return;
+			}
+
+			// we grab or create our PolygonCollider2D
+			PolygonCollider2D polygonCollider2D = InitializePolygonCollider2D(meshFilter);
+			if (polygonCollider2D == null)
+			{
+				return;
+			}
+
+			Vector3[] vectors = MeshFilterToVectors(meshFilter);
+			Vector2[] newPoints = VectorsToPoints(vectors);
+			EditorUtility.SetDirty(polygonCollider2D);
+			polygonCollider2D.SetPath(0, newPoints);
+		}
+
+		/// <summary>
+		/// Takes an array of vectors and outputs points
+		/// </summary>
+		/// <param name="vectors"></param>
+		/// <returns></returns>
+		private static Vector2[] VectorsToPoints(Vector3[] vectors)
+		{
+			List<Vector2> newColliderVertices = new List<Vector2>();
+
+			for (int i = 0; i < vectors.Length; i++)
+			{
+				newColliderVertices.Add(new Vector2(vectors[i].x, vectors[i].y));
+			}
+
+			Vector2[] newPoints = newColliderVertices.Distinct().ToArray();
+			return newPoints;
+		}
+
+		/// <summary>
+		/// Turns a meshfilter into an array of vectors
+		/// </summary>
+		/// <param name="meshFilter"></param>
+		/// <returns></returns>
+		private static Vector3[] MeshFilterToVectors(MeshFilter meshFilter)
+		{
+			List<Vector3> vertices = new List<Vector3>();
+			meshFilter.sharedMesh.GetVertices(vertices);
+
+			List<MMGeometry.MMEdge> boundaryPath = MMGeometry.GetEdges(meshFilter.sharedMesh.triangles).FindBoundary().SortEdges();
+
+			Vector3[] vectors = new Vector3[boundaryPath.Count];
+			for (int i = 0; i < boundaryPath.Count; i++)
+			{
+				vectors[i] = vertices[boundaryPath[i].Vertice1];
+			}
+
+			return vectors;
+		}
+
+		/// <summary>
+		/// Grabs or creates a polygon collider 2D
+		/// </summary>
+		/// <param name="meshFilter"></param>
+		/// <returns></returns>
+		private static PolygonCollider2D InitializePolygonCollider2D(MeshFilter meshFilter)
+		{
+			PolygonCollider2D polygonCollider2D = meshFilter.GetComponent<PolygonCollider2D>();
+			if (polygonCollider2D == null)
+			{
+				polygonCollider2D = meshFilter.gameObject.AddComponent<PolygonCollider2D>();
+			}
+			polygonCollider2D.pathCount = 1;
+			return polygonCollider2D;
+		}
+
+		/// <summary>
+		/// Makes sure that 
+		/// </summary>
+		/// <param name="meshFilter"></param>
+		/// <returns></returns>
+		private static bool ValidateMesh(MeshFilter meshFilter)
+		{
+			if (meshFilter.sharedMesh == null)
+			{
+				Debug.LogWarning("[MMMeshToPolygonCollider2D] " 
+				                 + meshFilter.gameObject.name 
+				                 + " needs to have at least a mesh set on its mesh filter component.");
+				return false;
+			}
+			return true;
+		}
+
+		/// <summary>
+		/// A method meant to be called via the Tools menu, that will go through all mesh colliders on an object and generate a polygon collider2D out of it
+		/// </summary>
+		[MenuItem("Tools/More Mountains/Collisions/Generate PolygonCollider2D", false, 601)]
+		public static void GeneratePolygonCollider2DMenu()
+		{
+			Transform activeTransform = Selection.activeTransform;
+			if (activeTransform == null)
+			{
+				Debug.LogWarning("[MMMeshToPolygonCollider2D] You need to select a gameobject first.");
+				return;
+			}
+
+			EditorSceneManager.MarkSceneDirty(activeTransform.gameObject.scene);
+			MeshFilter[] meshFilters = activeTransform.GetComponentsInChildren<MeshFilter>();
+
+			foreach (MeshFilter meshFilter in meshFilters)
+			{
+				GeneratePolygonCollider2D(meshFilter);                
+			}
+		}
+	}
+}

Assets/Feel/MMTools/Accessories/Editor/MMCollisions/MMMeshToPolygonCollider2D.cs.meta

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