diff --git a/extras/conf/udb/Includes/SRB222_linedefs.cfg b/extras/conf/udb/Includes/SRB222_linedefs.cfg
index 621b4abd53c4ff087664c9b24b0b424eae5d1e8b..68077862392a0ca2668d296f051203cd250e93ed 100644
--- a/extras/conf/udb/Includes/SRB222_linedefs.cfg
+++ b/extras/conf/udb/Includes/SRB222_linedefs.cfg
@@ -1221,52 +1221,6 @@ udmf
 				}
 			}
 		}
-		260
-		{
-			title = "Generalized 3D Floor";
-			prefix = "(260)";
-			id = "Sector_Set3dFloor";
-			requiresactivation = false;
-
-			arg0
-			{
-				title = "Target sector tag";
-				type = 13;
-			}
-			arg1
-			{
-				title = "Type";
-				type = 26;
-				default = 1;
-				enum
-				{
-					1 = "Solid";
-					2 = "Water";
-					3 = "Intangible";
-				}
-				flags
-				{
-					4 = "Render insides";
-					16 = "Only render insides";
-				}
-			}
-			arg2
-			{
-				title = "Flags";
-				type = 12;
-				enum
-				{
-					1 = "No shadow";
-					2 = "Double shadow";
-					4 = "Fog";
-				}
-			}
-			arg3
-			{
-				title = "Alpha";
-				default = 255;
-			}
-		}
 	}
 
 	linedeftrigger
diff --git a/src/p_spec.c b/src/p_spec.c
index 71ea145b9e79372102e0c2d9746d35a86d27c141..9195ef01995315cbd830687804cd91443f5959a3 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -6880,71 +6880,6 @@ void P_SpawnSpecials(boolean fromnetsave)
 				}
 				break;
 
-			case 260: // GZDoom-like 3D Floor.
-				{
-					UINT8 dtype = lines[i].args[1] & 3;
-					UINT8 dflags1 = lines[i].args[1] - dtype;
-					UINT8 dflags2 = lines[i].args[2];
-					UINT8 dopacity = lines[i].args[3];
-					boolean isfog = false;
-
-					if (dtype == 0)
-						dtype = 1;
-
-					ffloorflags = FOF_EXISTS;
-
-					if (dflags2 & 1) ffloorflags |= FOF_NOSHADE; // Disable light effects (Means no shadowcast)
-					if (dflags2 & 2) ffloorflags |= FOF_DOUBLESHADOW; // Restrict light inside (Means doubleshadow)
-					if (dflags2 & 4) isfog = true; // Fog effect (Explicitly render like a fog block)
-
-					if (dflags1 & 4) ffloorflags |= FOF_BOTHPLANES|FOF_ALLSIDES; // Render-inside
-					if (dflags1 & 16) ffloorflags |= FOF_INVERTSIDES|FOF_INVERTPLANES; // Invert visibility rules
-
-					// Fog block
-					if (isfog)
-						ffloorflags |= FOF_RENDERALL|FOF_CUTEXTRA|FOF_CUTSPRITES|FOF_BOTHPLANES|FOF_EXTRA|FOF_FOG|FOF_INVERTPLANES|FOF_ALLSIDES|FOF_INVERTSIDES;
-					else
-					{
-						ffloorflags |= FOF_RENDERALL;
-
-						// Solid
-						if (dtype == 1)
-							ffloorflags |= FOF_SOLID|FOF_CUTLEVEL;
-						// Water
-						else if (dtype == 2)
-							ffloorflags |= FOF_SWIMMABLE|FOF_CUTEXTRA|FOF_CUTSPRITES|FOF_EXTRA|FOF_RIPPLE;
-						// Intangible
-						else if (dtype == 3)
-							ffloorflags |= FOF_CUTEXTRA|FOF_CUTSPRITES|FOF_EXTRA;
-					}
-
-					// Non-opaque
-					if (dopacity < 255)
-					{
-						// Invisible
-						if (dopacity == 0)
-						{
-							// True invisible
-							if (ffloorflags & FOF_NOSHADE)
-								ffloorflags &= ~(FOF_RENDERALL|FOF_CUTEXTRA|FOF_CUTSPRITES|FOF_EXTRA|FOF_BOTHPLANES|FOF_ALLSIDES|FOF_CUTLEVEL);
-							// Shadow block
-							else
-							{
-								ffloorflags |= FOF_CUTSPRITES;
-								ffloorflags &= ~(FOF_RENDERALL|FOF_CUTEXTRA|FOF_EXTRA|FOF_BOTHPLANES|FOF_ALLSIDES|FOF_CUTLEVEL);
-							}
-						}
-						else
-						{
-							ffloorflags |= FOF_TRANSLUCENT|FOF_CUTEXTRA|FOF_EXTRA;
-							ffloorflags &= ~FOF_CUTLEVEL;
-						}
-					}
-
-					P_AddFakeFloorsByLine(i, dopacity, TMB_TRANSLUCENT, ffloorflags, secthinkers);
-				}
-				break;
-
 			case 300: // Trigger linedef executor
 			case 303: // Count rings
 			case 305: // Character ability