diff --git a/Source/Plugins/GZDoomEditing/VisualModes/Effect3DFloor.cs b/Source/Plugins/GZDoomEditing/VisualModes/Effect3DFloor.cs
index 3cb9020a..2dd7ed83 100644
--- a/Source/Plugins/GZDoomEditing/VisualModes/Effect3DFloor.cs
+++ b/Source/Plugins/GZDoomEditing/VisualModes/Effect3DFloor.cs
@@ -25,13 +25,17 @@ namespace CodeImp.DoomBuilder.GZDoomEditing
 
 		// Alpha transparency
 		private int alpha;
+		
+		// Vavoom type?
+		private bool vavoomtype;
 
 		// Properties
 		public int Alpha { get { return alpha; } }
 		public SectorLevel Floor { get { return floor; } }
 		public SectorLevel Ceiling { get { return ceiling; } }
 		public Linedef Linedef { get { return linedef; } }
-
+		public bool VavoomType { get { return vavoomtype; } }
+		
 		// Constructor
 		public Effect3DFloor(SectorData data, Linedef sourcelinedef) : base(data)
 		{
@@ -76,6 +80,7 @@ namespace CodeImp.DoomBuilder.GZDoomEditing
 			int argtype = (linedef.Args[1] & 0x03);
 			if(argtype != 0)
 			{
+				vavoomtype = false;
 				alpha = linedef.Args[3];
 				sd.Ceiling.CopyProperties(floor);
 				sd.Floor.CopyProperties(ceiling);
@@ -86,6 +91,7 @@ namespace CodeImp.DoomBuilder.GZDoomEditing
 			}
 			else
 			{
+				vavoomtype = true;
 				sd.Ceiling.CopyProperties(ceiling);
 				sd.Floor.CopyProperties(floor);
 				alpha = 255;
@@ -99,7 +105,7 @@ namespace CodeImp.DoomBuilder.GZDoomEditing
 			ceiling.alpha = alpha;
 			
 			// Do not adjust light? (works only for non-vavoom types)
-			if(((linedef.Args[2] & 1) != 0) && (argtype != 0))
+			if(((linedef.Args[2] & 1) != 0) && !vavoomtype)
 			{
 				floor.brightnessbelow = -1;
 				floor.colorbelow = PixelColor.FromInt(0);
diff --git a/Source/Plugins/GZDoomEditing/VisualModes/VisualMiddle3D.cs b/Source/Plugins/GZDoomEditing/VisualModes/VisualMiddle3D.cs
index c456700d..c48faf57 100644
--- a/Source/Plugins/GZDoomEditing/VisualModes/VisualMiddle3D.cs
+++ b/Source/Plugins/GZDoomEditing/VisualModes/VisualMiddle3D.cs
@@ -114,6 +114,11 @@ namespace CodeImp.DoomBuilder.GZDoomEditing
 			// Get texture scaled size
 			Vector2D tsz = new Vector2D(base.Texture.ScaledWidth, base.Texture.ScaledHeight);
 			
+			// For Vavoom type 3D floors the ceiling is lower than floor and they are reversed.
+			// We choose here.
+			float sourcetopheight = extrafloor.VavoomType ? sourceside.Sector.FloorHeight : sourceside.Sector.CeilHeight;
+			float sourcebottomheight = extrafloor.VavoomType ? sourceside.Sector.CeilHeight : sourceside.Sector.FloorHeight;
+			
 			// Determine texture coordinates plane as they would be in normal circumstances.
 			// We can then use this plane to find any texture coordinate we need.
 			// The logic here is the same as in the original VisualMiddleSingle (except that
@@ -121,25 +126,25 @@ namespace CodeImp.DoomBuilder.GZDoomEditing
 			// NOTE: I use a small bias for the floor height, because if the difference in
 			// height is 0 then the TexturePlane doesn't work!
 			TexturePlane tp = new TexturePlane();
-			float floorbias = (Sidedef.Other.Sector.FloorHeight == Sidedef.Sector.FloorHeight) ? 1.0f : 0.0f;
-			if(Sidedef.Line.IsFlagSet(General.Map.Config.LowerUnpeggedFlag))
-			{
-				// When lower unpegged is set, the lower texture is bound to the bottom
-				tp.tlt.y = (float)Sidedef.Sector.CeilHeight - (float)sourceside.Sector.FloorHeight;
-			}
+			float floorbias = (sourcetopheight == sourcebottomheight) ? 1.0f : 0.0f;
+
 			tp.trb.x = tp.tlt.x + Sidedef.Line.Length;
-			tp.trb.y = tp.tlt.y + ((float)sourceside.Sector.FloorHeight - ((float)Sidedef.Sector.FloorHeight + floorbias));
+			tp.trb.y = tp.tlt.y + (sourcetopheight - sourcebottomheight) + floorbias;
 			
 			// Apply texture offset
 			if(General.Map.Config.ScaledTextureOffsets && !base.Texture.WorldPanning)
 			{
 				tp.tlt += new Vector2D(Sidedef.OffsetX * base.Texture.Scale.x, Sidedef.OffsetY * base.Texture.Scale.y);
 				tp.trb += new Vector2D(Sidedef.OffsetX * base.Texture.Scale.x, Sidedef.OffsetY * base.Texture.Scale.y);
+				tp.tlt += new Vector2D(sourceside.OffsetX * base.Texture.Scale.x, sourceside.OffsetY * base.Texture.Scale.y);
+				tp.trb += new Vector2D(sourceside.OffsetX * base.Texture.Scale.x, sourceside.OffsetY * base.Texture.Scale.y);
 			}
 			else
 			{
 				tp.tlt += new Vector2D(Sidedef.OffsetX, Sidedef.OffsetY);
 				tp.trb += new Vector2D(Sidedef.OffsetX, Sidedef.OffsetY);
+				tp.tlt += new Vector2D(sourceside.OffsetX, sourceside.OffsetY);
+				tp.trb += new Vector2D(sourceside.OffsetX, sourceside.OffsetY);
 			}
 			
 			// Transform pixel coordinates to texture coordinates
@@ -147,8 +152,8 @@ namespace CodeImp.DoomBuilder.GZDoomEditing
 			tp.trb /= tsz;
 			
 			// Left top and right bottom of the geometry that
-			tp.vlt = new Vector3D(vl.x, vl.y, (float)sourceside.Sector.FloorHeight);
-			tp.vrb = new Vector3D(vr.x, vr.y, (float)Sidedef.Sector.FloorHeight + floorbias);
+			tp.vlt = new Vector3D(vl.x, vl.y, sourcetopheight);
+			tp.vrb = new Vector3D(vr.x, vr.y, sourcebottomheight + floorbias);
 			
 			// Make the right-top coordinates
 			tp.trt = new Vector2D(tp.trb.x, tp.tlt.y);
diff --git a/Tests/UDMF/udmfexample.wad b/Tests/UDMF/udmfexample.wad
index 00478e65..78741a57 100644
Binary files a/Tests/UDMF/udmfexample.wad and b/Tests/UDMF/udmfexample.wad differ