View projection is now updated when engaging Visual mode. This means no more distorted visuals after disproportionately changing window size.

Source/Core/Geometry/ProjectedFrustum2D.cs

@@ -27,19 +27,19 @@ namespace CodeImp.DoomBuilder.Geometry
 		#region ================== Variables
 		
 		// Frustum settings
-		private float near;
-		private float far;
-		private float fov;
-		private Vector2D pos;
-		private float xyangle;
-		private float zangle;
+		private readonly float near;
+		private readonly float far;
+		private readonly float fov;
+		private readonly Vector2D pos;
+		private readonly float xyangle;
+		private readonly float zangle;
 		
 		// Frustum lines
-		private Line2D[] lines;
+		private readonly Line2D[] lines;
 
 		// Circle
-		private Vector2D center;
-		private float radius;
+		private readonly Vector2D center;
+		private readonly float radius;
 		
 		#endregion
 

Source/Core/VisualModes/VisualMode.cs

@@ -157,6 +157,9 @@ namespace CodeImp.DoomBuilder.VisualModes
 		public override void OnEngage()
 		{
 			base.OnEngage();
+
+			// Update projection (mxd)
+			General.Map.CRenderer3D.CreateProjection();
 			
 			// Update the used textures
 			General.Map.Data.UpdateUsedTextures();