MapRenderer: Only cleanup if there's something to clean.
MapRenderer: Only cleanup if there's something to clean.

--- a/ARConfiguration.cs
+++ b/ARConfiguration.cs
@@ -149,7 +149,7 @@
 
 			GUILayout.BeginHorizontal(GUILayout.ExpandWidth(true));
 
-			bool requireLineOfSight = GUILayout.Toggle(ARConfiguration.RequireLineOfSight, "Require Line of Sight");
+			bool requireLineOfSight = GUITools.Toggle(ARConfiguration.RequireLineOfSight, "Require Line of Sight");
 			if (requireLineOfSight != ARConfiguration.RequireLineOfSight)
 			{
 				ARConfiguration.RequireLineOfSight = requireLineOfSight;
@@ -161,7 +161,7 @@
 			GUILayout.BeginHorizontal(GUILayout.ExpandWidth(true));
 
 			bool requireConnectionForControl =
-				GUILayout.Toggle(
+				GUITools.Toggle(
 					ARConfiguration.RequireConnectionForControl,
 					"Require Connection for Probe Control"
 				);
@@ -175,7 +175,7 @@
 
 			GUILayout.BeginHorizontal();
 
-			bool fixedPowerCost = GUILayout.Toggle(ARConfiguration.FixedPowerCost, "Use Fixed Power Cost");
+			bool fixedPowerCost = GUITools.Toggle(ARConfiguration.FixedPowerCost, "Use Fixed Power Cost");
 			if (fixedPowerCost != ARConfiguration.FixedPowerCost)
 			{
 				ARConfiguration.FixedPowerCost = fixedPowerCost;

--- a/ARFlightController.cs
+++ b/ARFlightController.cs
@@ -41,6 +41,8 @@
 		protected Dictionary<ConnectionStatus, string> connectionTextures;
 		protected Dictionary<ConnectionStatus, Texture> appLauncherTextures;
 
+		protected ARMapRenderer mapRenderer;
+
 		protected IButton toolbarButton;
 
 		protected ApplicationLauncherButton appLauncherButton;
@@ -142,6 +144,11 @@
 
 			GameEvents.onGameSceneLoadRequested.Add(this.onSceneChangeRequested);
 			GameEvents.onVesselChange.Add(this.onVesselChange);
+		}
+
+		protected void Start()
+		{
+			this.mapRenderer = MapView.MapCamera.gameObject.AddComponent<ARMapRenderer>();
 		}
 
 		protected void FixedUpdate()
@@ -202,7 +209,7 @@
 				// ...unlock the controls.
 				InputLockManager.RemoveControlLock(this.lockID);
 			}
-
+				
 			if (
 				(this.toolbarButton != null || this.appLauncherButton != null) &&
 				HighLogic.LoadedSceneIsFlight &&
@@ -297,6 +304,11 @@
 		{
 			InputLockManager.RemoveControlLock(this.lockID);
 
+			if (this.mapRenderer != null)
+			{
+				GameObject.Destroy(this.mapRenderer);
+			}
+
 			if (this.toolbarButton != null)
 			{
 				this.toolbarButton.Destroy();

file:b/ARMapRenderer.cs (new)
--- /dev/null
+++ b/ARMapRenderer.cs
@@ -1,1 +1,273 @@
-
+// AntennaRange
+//
+// ARMapRenderer.cs
+//
+// Copyright © 2014, toadicus
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice,
+//    this list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+//    this list of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be used
+//    to endorse or promote products derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+using KSP;
+using System;
+using System.Collections.Generic;
+using ToadicusTools;
+using UnityEngine;
+
+namespace AntennaRange
+{
+	public class ARMapRenderer : MonoBehaviour
+	{
+		#region Fields
+		private Dictionary<Guid, LineRenderer> vesselLineRenderers;
+		private Dictionary<Guid, bool> vesselFrameCache;
+		#endregion
+
+		#region Properties
+		public LineRenderer this[Guid idx]
+		{
+			get
+			{
+				if (this.vesselLineRenderers == null)
+				{
+					this.vesselLineRenderers = new Dictionary<Guid, LineRenderer>();
+				}
+
+				if (!this.vesselLineRenderers.ContainsKey(idx))
+				{
+					GameObject obj = new GameObject();
+					obj.layer = 31;
+
+					LineRenderer lr = obj.AddComponent<LineRenderer>();
+
+					lr.SetColors(Color.green, Color.green);
+					lr.material = new Material(Shader.Find("Particles/Additive"));
+					lr.SetVertexCount(2);
+
+					this.vesselLineRenderers[idx] = lr;
+				}
+
+				return this.vesselLineRenderers[idx];
+			}
+		}
+		#endregion
+
+		#region MonoBehaviour Lifecycle
+		private void Awake()
+		{
+			this.vesselLineRenderers = new Dictionary<Guid, LineRenderer>();
+			this.vesselFrameCache = new Dictionary<Guid, bool>();
+		}
+
+		private void OnPreCull()
+		{
+			if (!HighLogic.LoadedSceneIsFlight || !MapView.MapIsEnabled)
+			{
+				this.Cleanup();
+
+				return;
+			}
+
+			Tools.DebugLogger log = Tools.DebugLogger.New(this);
+
+			try
+			{
+				log.AppendFormat("OnPreCull.\n");
+
+				log.AppendFormat("\tMapView: Draw3DLines: {0}\n" +
+					"\tMapView.MapCamera.camera.fieldOfView: {1}\n" +
+					"\tMapView.MapCamera.Distance: {2}\n",
+					MapView.Draw3DLines,
+					MapView.MapCamera.camera.fieldOfView,
+					MapView.MapCamera.Distance
+				);
+
+				this.vesselFrameCache.Clear();
+
+				log.AppendLine("vesselFrameCache cleared.");
+
+				if (FlightGlobals.ready && FlightGlobals.Vessels != null)
+				{
+					log.AppendLine("FlightGlobals ready and Vessels list not null.");
+
+					foreach (Vessel vessel in FlightGlobals.Vessels)
+					{
+						if (vessel == null)
+						{
+							log.AppendFormat("Skipping vessel {0} altogether because it is null.\n");
+							continue;
+						}
+
+						log.AppendFormat("Checking vessel {0}.\n", vessel.vesselName);
+
+						switch (vessel.vesselType)
+						{
+							case VesselType.Debris:
+							case VesselType.EVA:
+							case VesselType.Unknown:
+							case VesselType.SpaceObject:
+								log.AppendFormat("\tDiscarded because vessel is of invalid type {0}\n",
+									vessel.vesselType);
+								continue;
+						}
+
+						log.Append("\tChecking connection status...\n");
+
+						if (vessel.HasConnectedRelay())
+						{
+							log.AppendLine("\tHas a connection, checking for the best relay to use for the line.");
+
+							IAntennaRelay vesselRelay = null;
+							float bestScore = float.PositiveInfinity;
+							float relayScore = float.NaN;
+
+							foreach (IAntennaRelay relay in RelayDatabase.Instance[vessel].Values)
+							{
+								relayScore = (float)relay.transmitDistance / relay.maxTransmitDistance;
+
+								if (relayScore < bestScore)
+								{
+									bestScore = relayScore;
+									vesselRelay = relay as IAntennaRelay;
+								}
+							}
+
+							if (vesselRelay != null)
+							{
+								log.AppendFormat("\t...picked relay {0} with a score of {1}", 
+									vesselRelay, relayScore
+								);
+
+								this.SetRelayVertices(vesselRelay);
+							}
+						}
+						else if (this.vesselLineRenderers.ContainsKey(vessel.id))
+						{
+							log.AppendLine("\tDisabling line because vessel has no connection.");
+							this[vessel.id].enabled = false;
+						}
+					}
+				}
+			}
+			finally
+			{
+				log.Print();
+			}
+		}
+
+		private void OnDestroy()
+		{
+			this.Cleanup();
+
+			print("ARMapRenderer: Destroyed.");
+		}
+		#endregion
+
+		private void SetRelayVertices(IAntennaRelay relay)
+		{
+			do
+			{
+				if (this.vesselFrameCache.ContainsKey(relay.vessel.id))
+				{
+					break;
+				}
+
+				LineRenderer renderer = this[relay.vessel.id];
+
+				if (relay.CanTransmit())
+				{
+					Vector3d start;
+					Vector3d end;
+
+					renderer.enabled = true;
+
+					if (relay.transmitDistance < relay.nominalTransmitDistance)
+					{
+						renderer.SetColors(Color.green, Color.green);
+					}
+					else
+					{
+						renderer.SetColors(Color.yellow, Color.yellow);
+					}
+
+					start = ScaledSpace.LocalToScaledSpace(relay.vessel.GetWorldPos3D());
+
+					if (relay.nearestRelay == null)
+					{
+						end = ScaledSpace.LocalToScaledSpace(AntennaRelay.Kerbin.position);
+					}
+					else
+					{
+						end = ScaledSpace.LocalToScaledSpace(relay.nearestRelay.vessel.GetWorldPos3D());
+					}
+
+					float lineWidth;
+
+					if (MapView.Draw3DLines)
+					{
+						lineWidth = 0.004f * MapView.MapCamera.Distance;
+					}
+					else
+					{
+						lineWidth = 1f;
+
+						start = MapView.MapCamera.camera.WorldToScreenPoint(start);
+						end = MapView.MapCamera.camera.WorldToScreenPoint(end);
+
+						float d = Screen.height / 2f + 0.01f;
+						start.z = start.z >= 0f ? d : -d;
+						end.z = end.z >= 0f ? d : -d;
+					}
+
+					renderer.SetWidth(lineWidth, lineWidth);
+
+					renderer.SetPosition(0, start);
+					renderer.SetPosition(1, end);
+
+					this.vesselFrameCache[relay.vessel.id] = true;
+
+					relay = relay.nearestRelay;
+				}
+			}
+			while (relay != null);
+		}
+
+		public void Cleanup()
+		{
+			if (this.vesselLineRenderers != null && this.vesselLineRenderers.Count > 0)
+			{
+				foreach (LineRenderer lineRenderer in this.vesselLineRenderers.Values)
+				{
+					lineRenderer.enabled = false;
+					GameObject.Destroy(lineRenderer.gameObject);
+				}
+				this.vesselLineRenderers.Clear();
+			}
+
+			if (this.vesselFrameCache != null && this.vesselFrameCache.Count > 0)
+			{
+				this.vesselFrameCache.Clear();
+			}
+		}
+	}
+}
+
+

--- a/AntennaRange.csproj
+++ b/AntennaRange.csproj
@@ -78,6 +78,7 @@
     <Compile Include="RelayExtensions.cs" />
     <Compile Include="ARConfiguration.cs" />
     <Compile Include="ARFlightController.cs" />
+    <Compile Include="ARMapRenderer.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

--- a/AntennaRelay.cs
+++ b/AntennaRelay.cs
@@ -36,9 +36,7 @@
 	public class AntennaRelay
 	{
 		// We don't have a Bard, so we'll hide Kerbin here.
-		protected CelestialBody Kerbin;
-
-		protected CelestialBody _firstOccludingBody;
+		public static CelestialBody Kerbin;
 
 		protected IAntennaRelay _nearestRelayCache;
 		protected IAntennaRelay moduleRef;
@@ -82,15 +80,12 @@
 		}
 
 		/// <summary>
-		/// Gets the first occluding body.
-		/// </summary>
-		/// <value>The first occluding body.</value>
-		public CelestialBody firstOccludingBody
-		{
-			get
-			{
-				return this._firstOccludingBody;
-			}
+		/// Gets the first <see cref="CelestialBody"/> found to be blocking line of sight.
+		/// </summary>
+		public virtual CelestialBody firstOccludingBody
+		{
+			get;
+			protected set;
 		}
 
 		/// <summary>
@@ -107,7 +102,7 @@
 				if (this.nearestRelay == null)
 				{
 					// .. return the distance to Kerbin
-					return this.DistanceTo(this.Kerbin);
+					return this.DistanceTo(Kerbin);
 				}
 				else
 				{
@@ -117,6 +112,12 @@
 			}
 		}
 
+		public virtual double nominalTransmitDistance
+		{
+			get;
+			set;
+		}
+
 		/// <summary>
 		/// The maximum distance at which this relay can operate.
 		/// </summary>
@@ -144,19 +145,23 @@
 		/// <returns><c>true</c> if this instance can transmit; otherwise, <c>false</c>.</returns>
 		public virtual bool CanTransmit()
 		{
+			CelestialBody fob = null;
+
 			if (
 				this.transmitDistance > this.maxTransmitDistance ||
 				(
 					ARConfiguration.RequireLineOfSight &&
 					this.nearestRelay == null &&
-					!this.vessel.hasLineOfSightTo(this.Kerbin, out this._firstOccludingBody, ARConfiguration.RadiusRatio)
+					!this.vessel.hasLineOfSightTo(Kerbin, out fob)
 				)
 			)
 			{
+				this.firstOccludingBody = fob;
 				return false;
 			}
 			else
 			{
+				this.firstOccludingBody = null;
 				return true;
 			}
 		}
@@ -187,7 +192,7 @@
 				this.vessel.id
 			));
 
-			this._firstOccludingBody = null;
+			this.firstOccludingBody = null;
 
 			// Set this vessel as checked, so that we don't check it again.
 			RelayDatabase.Instance.CheckedVesselsTable[vessel.id] = true;
@@ -229,9 +234,12 @@
 				}
 
 				// Skip vessels to which we do not have line of sight.
+				CelestialBody fob = null;
+
 				if (ARConfiguration.RequireLineOfSight &&
-					!this.vessel.hasLineOfSightTo(potentialVessel, out this._firstOccludingBody, ARConfiguration.RadiusRatio))
-				{
+					!this.vessel.hasLineOfSightTo(potentialVessel, out fob, ARConfiguration.RadiusRatio))
+				{
+					this.firstOccludingBody = fob;
 					Tools.PostDebugMessage(
 						this,
 						"Vessel {0} discarded because we do not have line of sight.",
@@ -239,6 +247,8 @@
 					);
 					continue;
 				}
+
+				this.firstOccludingBody = null;
 
 				// Find the distance from here to the vessel...
 				double potentialSqrDistance = (potentialVessel.GetWorldPos3D() - vessel.GetWorldPos3D()).sqrMagnitude;
@@ -297,11 +307,14 @@
 			this.moduleRef = module;
 
 			this.searchTimer = new System.Diagnostics.Stopwatch();
-			this.millisecondsBetweenSearches = 5000;
+			this.millisecondsBetweenSearches = 1250;
 
 			// HACK: This might not be safe in all circumstances, but since AntennaRelays are not built until Start,
 			// we hope it is safe enough.
-			this.Kerbin = FlightGlobals.Bodies.FirstOrDefault(b => b.name == "Kerbin");
+			if (AntennaRelay.Kerbin == null)
+			{
+				AntennaRelay.Kerbin = FlightGlobals.Bodies.FirstOrDefault(b => b.name == "Kerbin");
+			}
 		}
 	}
 }

--- a/IAntennaRelay.cs
+++ b/IAntennaRelay.cs
@@ -42,17 +42,27 @@
 		/// <value>The parent Vessel.</value>
 		Vessel vessel { get; }
 
+		IAntennaRelay nearestRelay { get; }
+
 		/// <summary>
 		/// Gets the distance to the nearest relay or Kerbin, whichever is closer.
 		/// </summary>
 		/// <value>The distance to the nearest relay or Kerbin, whichever is closer.</value>
 		double transmitDistance { get; }
 
+		double nominalTransmitDistance { get; }
+
 		/// <summary>
 		/// The maximum distance at which this relay can operate.
 		/// </summary>
 		/// <value>The max transmit distance.</value>
 		float maxTransmitDistance { get; }
+
+		/// <summary>
+		/// The first CelestialBody blocking line of sight to a 
+		/// </summary>
+		/// <value>The first occluding body.</value>
+		CelestialBody firstOccludingBody { get; }
 
 		/// <summary>
 		/// Gets a value indicating whether this <see cref="AntennaRange.ProtoDataTransmitter"/> has been checked during

--- a/ModuleLimitedDataTransmitter.cs
+++ b/ModuleLimitedDataTransmitter.cs
@@ -122,6 +122,19 @@
 			}
 		}
 
+		public IAntennaRelay nearestRelay
+		{
+			get
+			{
+				if (this.relay == null)
+				{
+					return null;
+				}
+
+				return this.relay.nearestRelay;
+			}
+		}
+
 		// Returns the distance to the nearest relay or Kerbin, whichever is closer.
 		public double transmitDistance
 		{
@@ -131,12 +144,28 @@
 			}
 		}
 
+		public double nominalTransmitDistance
+		{
+			get
+			{
+				return this.nominalRange;
+			}
+		}
+
 		// Returns the maximum distance this module can transmit
 		public float maxTransmitDistance
 		{
 			get
 			{
 				return Mathf.Sqrt (this.maxPowerFactor) * this.nominalRange;
+			}
+		}
+
+		public CelestialBody firstOccludingBody
+		{
+			get
+			{
+				return this.relay.firstOccludingBody;
 			}
 		}
 
@@ -255,6 +284,7 @@
 			{
 				this.relay = new AntennaRelay(this);
 				this.relay.maxTransmitDistance = this.maxTransmitDistance;
+				this.relay.nominalTransmitDistance = this.nominalRange;
 
 				this.UImaxTransmitDistance = Tools.MuMech_ToSI(this.maxTransmitDistance) + "m";
 

--- a/Properties/AssemblyInfo.cs
+++ b/Properties/AssemblyInfo.cs
@@ -39,7 +39,7 @@
 // The assembly version has the format "{Major}.{Minor}.{Build}.{Revision}".
 // The form "{Major}.{Minor}.*" will automatically update the build and revision,
 // and "{Major}.{Minor}.{Build}.*" will update just the revision.
-[assembly: AssemblyVersion("1.7.*")]
+[assembly: AssemblyVersion("1.8.*")]
 // The following attributes are used to specify the signing key for the assembly,
 // if desired. See the Mono documentation for more information about signing.
 //[assembly: AssemblyDelaySign(false)]

--- a/ProtoAntennaRelay.cs
+++ b/ProtoAntennaRelay.cs
@@ -47,6 +47,14 @@
 			get
 			{
 				return this.protoPart.pVesselRef.vesselRef;
+			}
+		}
+
+		public override double nominalTransmitDistance
+		{
+			get
+			{
+				return this.moduleRef.nominalTransmitDistance;
 			}
 		}