first commit

Packages/com.arongranberg.aline/ExampleScenes~/Example1_Gizmos/GizmoSphereExample.cs

@@ -0,0 +1,60 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using Drawing;
+using System.Linq;
+
+namespace Drawing.Examples {
+	[HelpURL("http://arongranberg.com/aline/documentation/stable/gizmosphereexample.html")]
+	public class GizmoSphereExample : MonoBehaviourGizmos {
+		public Color gizmoColor = new Color(1.0f, 88/255f, 85/255f);
+		public Color gizmoColor2 = new Color(79/255f, 204/255f, 237/255f);
+
+		public override void DrawGizmos () {
+			using (Draw.InLocalSpace(transform)) {
+				Draw.WireSphere(Vector3.zero, 0.5f, gizmoColor);
+
+				foreach (var contact in contactForces.Values) {
+					Draw.Circle(contact.lastPoint, contact.lastNormal, 0.1f * contact.impulse, gizmoColor2);
+					Draw.SolidCircle(contact.lastPoint, contact.lastNormal, 0.1f * contact.impulse, gizmoColor2);
+				}
+			}
+		}
+
+		void FixedUpdate () {
+			foreach (var collider in contactForces.Keys.ToList()) {
+				var c = contactForces[collider];
+				if (c.impulse > 0.1f) {
+					c.impulse = Mathf.Lerp(c.impulse, 0, 10 * Time.fixedDeltaTime);
+					c.smoothImpulse = Mathf.Lerp(c.impulse, c.smoothImpulse, 20 * Time.fixedDeltaTime);
+					contactForces[collider] = c;
+				} else {
+					contactForces.Remove(collider);
+				}
+			}
+		}
+
+		struct Contact {
+			public float impulse;
+			public float smoothImpulse;
+			public Vector3 lastPoint;
+			public Vector3 lastNormal;
+		}
+		Dictionary<Collider, Contact> contactForces = new Dictionary<Collider, Contact>();
+
+		void OnCollisionStay (Collision collision) {
+			foreach (ContactPoint contact in collision.contacts) {
+				if (!contactForces.ContainsKey(collision.collider)) {
+					contactForces.Add(collision.collider, new Contact { impulse = 2f });
+				}
+
+				var c = contactForces[collision.collider];
+				c.impulse = Mathf.Max(c.impulse, 1);
+				c.lastPoint = transform.InverseTransformPoint(contact.point);
+				c.lastNormal = transform.InverseTransformVector(contact.normal);
+				contactForces[collision.collider] = c;
+				break;
+			}
+		}
+	}
+}