spinning

KavTest/Components/AngularVelocityComponent.cs

@@ -0,0 +1,15 @@
+using Encompass;
+using Microsoft.Xna.Framework;
+
+namespace KavTest.Components
+{
+    public struct AngularVelocityComponent : IComponent
+    {
+        public Vector3 AngularVelocity { get; }
+
+        public AngularVelocityComponent(Vector3 angularVelocity)
+        {
+            AngularVelocity = angularVelocity;
+        }
+    }
+}

KavTest/Engines/RotationEngine.cs

@@ -0,0 +1,29 @@
+using Encompass;
+using KavTest.Components;
+using Microsoft.Xna.Framework;
+
+namespace KavTest.Engines
+{
+    [Reads(typeof(TransformComponent), typeof(AngularVelocityComponent))]
+    [Writes(typeof(TransformComponent))]
+    public class RotationEngine : Engine
+    {
+        public override void Update(double dt)
+        {
+            foreach (var entity in ReadEntities<AngularVelocityComponent>())
+            {
+                if (HasComponent<TransformComponent>(entity))
+                {
+                    ref readonly var angularVelocityComponent = ref GetComponent<AngularVelocityComponent>(entity);
+                    ref readonly var transformComponent = ref GetComponent<TransformComponent>(entity);
+
+                    var angularVelocity = angularVelocityComponent.AngularVelocity * (float)dt;
+                    var transform = transformComponent.Transform;
+
+                    var newTransform = Matrix.Transform(transform, Quaternion.CreateFromYawPitchRoll(angularVelocity.X, angularVelocity.Y, angularVelocity.Z));
+                    SetComponent(entity, new TransformComponent(newTransform));
+                }
+            }
+        }
+    }
+}

KavTest/Engines/Spawners/RustyBallSpawner.cs

@@ -20,6 +20,7 @@ namespace KavTest.Spawners
 
             AddComponent(entity, new TransformComponent(message.Transform));
             AddComponent(entity, new ModelComponent(RustyBallModel));
+            AddComponent(entity, new AngularVelocityComponent(new Microsoft.Xna.Framework.Vector3(5, -2, 1)));
         }
     }
 }

KavTest/KavTestGame.cs

@@ -1,6 +1,7 @@
 using System.IO;
 using Encompass;
 using KavTest.Components;
+using KavTest.Engines;
 using KavTest.Messages;
 using KavTest.Renderers;
 using KavTest.Spawners;
@@ -35,6 +36,7 @@ namespace KavTest
                 Smuggler.Importer.ImportGLB(GraphicsDevice, File.OpenRead("Content/cube.glb"))
             );
 
+            WorldBuilder.AddEngine(new RotationEngine());
             WorldBuilder.AddEngine(new RustyBallSpawner(rustyBallModel));
             WorldBuilder.AddEngine(new LightBulbSpawner());
             WorldBuilder.AddGeneralRenderer(new SceneRenderer(GraphicsDevice), 0);