Index: source/simulation2/components/CCmpSelectable.cpp
===================================================================
--- source/simulation2/components/CCmpSelectable.cpp
+++ source/simulation2/components/CCmpSelectable.cpp
@@ -1,4 +1,4 @@
-/* Copyright (C) 2019 Wildfire Games.
+/* Copyright (C) 2020 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -107,9 +107,36 @@
 						"<element name='LineThickness' a:help='Thickness of the line, in world units.'><ref name='positiveDecimal'/></element>"
 					"</element>"
 				"</choice>"
-			"</element>";
+			"</element>"
+			"<optional>"
+				"<choice>"
+					"<element name='Square' a:help='Set the selection to a square of the given size'>"
+						"<attribute name='width' a:help='Size of the selection along the left/right direction (in metres)'>"
+							"<data type='decimal'>"
+								"<param name='minExclusive'>0.0</param>"
+							"</data>"
+						"</attribute>"
+						"<attribute name='depth' a:help='Size of the selection along the front/back direction (in metres)'>"
+							"<data type='decimal'>"
+								"<param name='minExclusive'>0.0</param>"
+							"</data>"
+						"</attribute>"
+					"</element>"
+					"<element name='Circle' a:help='Set the selection to a circle of the given size'>"
+						"<attribute name='radius' a:help='Radius of the selection (in metres)'>"
+							"<data type='decimal'>"
+								"<param name='minExclusive'>0.0</param>"
+							"</data>"
+						"</attribute>"
+					"</element>"
+				"</choice>"
+			"</optional>";
 	}
 
+	EShape m_Shape;
+	entity_pos_t m_Size0; // width/radius
+	entity_pos_t m_Size1; // height/radius
+
 	virtual void Init(const CParamNode& paramNode)
 	{
 		m_EditorOnly = paramNode.GetChild("EditorOnly").IsOk();
@@ -145,6 +172,22 @@
 			m_OverlayDescriptor.m_LineThickness = outlineNode.GetChild("LineThickness").ToFloat();
 		}
 
+		if (paramNode.GetChild("Square").IsOk())
+		{
+			m_Shape = SQUARE;
+			m_Size0 = paramNode.GetChild("Square").GetChild("@width").ToFixed();
+			m_Size1 = paramNode.GetChild("Square").GetChild("@depth").ToFixed();
+		}
+		else if (paramNode.GetChild("Circle").IsOk())
+		{
+			m_Shape = CIRCLE;
+			m_Size0 = m_Size1 = paramNode.GetChild("Circle").GetChild("@radius").ToFixed();
+		}
+		else
+		{
+			m_Shape = NONE;
+		}
+
 		m_EnabledInterpolate = false;
 		m_EnabledRenderSubmit = false;
 		UpdateMessageSubscriptions();
@@ -218,7 +261,7 @@
 	void RenderSubmit(SceneCollector& collector, const CFrustum& frustum, bool culling);
 
 	/**
-	 * Draw a textured line overlay. The selection overlays for structures are based solely on footprint shape.
+	 * Draw a textured line overlay.
 	 */
 	void UpdateTexturedLineOverlay(const SOverlayDescriptor* overlayDescriptor, SOverlayTexturedLine& overlay, float frameOffset);
 
@@ -427,14 +470,18 @@
 		return;
 
 	CmpPtr<ICmpPosition> cmpPosition(GetEntityHandle());
-	CmpPtr<ICmpFootprint> cmpFootprint(GetEntityHandle());
-	if (!cmpFootprint || !cmpPosition || !cmpPosition->IsInWorld())
+	if (!cmpPosition || !cmpPosition->IsInWorld())
 		return;
 
-	ICmpFootprint::EShape fpShape;
-	entity_pos_t fpSize0_fixed, fpSize1_fixed, fpHeight_fixed;
-	cmpFootprint->GetShape(fpShape, fpSize0_fixed, fpSize1_fixed, fpHeight_fixed);
-
+	ICmpFootprint::EShape shape;
+	if (m_Shape == ICmpSelectable::NONE)
+	{
+		CmpPtr<ICmpFootprint> cmpFootprint(GetEntityHandle());
+		if (!cmpFootprint)
+			return;
+		entity_pos_t h;
+		cmpFootprint->GetShape(shape, m_Size0, m_Size1, h);
+	}
 	float rotY;
 	CVector2D origin;
 	cmpPosition->GetInterpolatedPosition2D(frameOffset, origin.X, origin.Y, rotY);
@@ -443,10 +490,10 @@
 	overlay.m_Color = m_Color;
 	overlay.CreateOverlayTexture(overlayDescriptor);
 
-	if (fpShape == ICmpFootprint::SQUARE)
-		SimRender::ConstructTexturedLineBox(overlay, origin, cmpPosition->GetRotation(), fpSize0_fixed.ToFloat(), fpSize1_fixed.ToFloat());
+	if (m_Shape == ICmpSelectable::SQUARE || shape == ICmpFootprint::SQUARE)
+		SimRender::ConstructTexturedLineBox(overlay, origin, cmpPosition->GetRotation(), m_Size0.ToFloat(), m_Size1.ToFloat());
 	else
-		SimRender::ConstructTexturedLineCircle(overlay, origin, fpSize0_fixed.ToFloat());
+		SimRender::ConstructTexturedLineCircle(overlay, origin, m_Size0.ToFloat());
 }
 
 void CCmpSelectable::UpdateDynamicOverlay(float frameOffset)
@@ -462,10 +509,19 @@
 		return;
 
 	CmpPtr<ICmpPosition> cmpPosition(GetEntityHandle());
-	CmpPtr<ICmpFootprint> cmpFootprint(GetEntityHandle());
-	if (!cmpFootprint || !cmpPosition || !cmpPosition->IsInWorld())
+	if (!cmpPosition || !cmpPosition->IsInWorld())
 		return;
 
+	ICmpFootprint::EShape shape;
+	if (m_Shape == ICmpSelectable::NONE)
+	{
+		CmpPtr<ICmpFootprint> cmpFootprint(GetEntityHandle());
+		if (!cmpFootprint)
+			return;
+		entity_pos_t h;
+		cmpFootprint->GetShape(shape, m_Size0, m_Size1, h);
+	}
+
 	float rotY;
 	CVector2D position;
 	cmpPosition->GetInterpolatedPosition2D(frameOffset, position.X, position.Y, rotY);
@@ -477,10 +533,6 @@
 	CTerrain* terrain = cmpTerrain->GetCTerrain();
 	ENSURE(terrain);
 
-	ICmpFootprint::EShape fpShape;
-	entity_pos_t fpSize0_fixed, fpSize1_fixed, fpHeight_fixed;
-	cmpFootprint->GetShape(fpShape, fpSize0_fixed, fpSize1_fixed, fpHeight_fixed);
-
 	// ---------------------------------------------------------------------------------
 
 	if (!m_UnitOverlay)
@@ -510,9 +562,9 @@
 	CVector2D unitX(c, s);
 	CVector2D unitZ(-s, c);
 
-	float halfSizeX = fpSize0_fixed.ToFloat();
-	float halfSizeZ = fpSize1_fixed.ToFloat();
-	if (fpShape == ICmpFootprint::SQUARE)
+	float halfSizeX = m_Size0.ToFloat();
+	float halfSizeZ = m_Size1.ToFloat();
+	if (m_Shape == ICmpSelectable::SQUARE || shape == ICmpFootprint::SQUARE)
 	{
 		halfSizeX /= 2.0f;
 		halfSizeZ /= 2.0f;
Index: source/simulation2/components/ICmpSelectable.h
===================================================================
--- source/simulation2/components/ICmpSelectable.h
+++ source/simulation2/components/ICmpSelectable.h
@@ -25,6 +25,12 @@
 class ICmpSelectable : public IComponent
 {
 public:
+	enum EShape
+	{
+		NONE,
+		CIRCLE,
+		SQUARE
+	};
 	/**
 	 * Returns true if the entity is only selectable in Atlas editor, e.g. a decorative visual actor.
 	 */