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code/tools/LeafBlower.cs

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+namespace Sandbox.Tools
+{
+	[Library( "tool_leafblower", Title = "Leaf Blower", Description = "Blow me", Group = "fun" )]
+	public partial class LeafBlowerTool : BaseTool
+	{
+		protected virtual float Force => 128;
+		protected virtual float MaxDistance => 512;
+		protected virtual bool Massless => true;
+
+		public override void Simulate()
+		{
+			if ( !Host.IsServer )
+				return;
+
+			using ( Prediction.Off() )
+			{
+				bool push = Input.Down( InputButton.Attack1 );
+				if ( !push && !Input.Down( InputButton.Attack2 ) )
+					return;
+
+				var startPos = Owner.EyePos;
+				var dir = Owner.EyeRot.Forward;
+
+				var tr = Trace.Ray( startPos, startPos + dir * MaxTraceDistance )
+					.Ignore( Owner )
+					.HitLayer( CollisionLayer.Debris )
+					.Run();
+
+				if ( !tr.Hit )
+					return;
+
+				if ( !tr.Entity.IsValid() )
+					return;
+
+				if ( tr.Entity.IsWorld )
+					return;
+
+				var body = tr.Body;
+
+				if ( !body.IsValid() )
+					return;
+
+				var direction = tr.EndPos - tr.StartPos;
+				var distance = direction.Length;
+				var ratio = (1.0f - (distance / MaxDistance)).Clamp( 0, 1 ) * (push ? 1.0f : -1.0f);
+				var force = direction * (Force * ratio);
+
+				if ( Massless )
+				{
+					force *= body.Mass;
+				}
+
+				body.ApplyForceAt( tr.EndPos, force );
+			}
+		}
+	}
+}