diff --git a/src/p_setup.c b/src/p_setup.c
index ec6cb64d7..02c66e9bd 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -722,7 +722,7 @@ static void GeneralDefaults(void)
 	side_t *sd;
 	sector_t *sc;
 	mapthing_t *mt;
-//	vertex_t* vt;
+	vertex_t* vt;
 
 	for (i = 0, ld = lines; i < numlines; i++, ld++)
 	{
@@ -848,7 +848,7 @@ static void GeneralDefaults(void)
 		mt->xdeathtrigger = 0;
 		mt->raisetrigger = 0;*/
 	}
-/*
+
 	for (i = 0, vt = vertexes; i < numvertexes; i++, vt++)
 	{
 		// Initialization.
@@ -857,7 +857,7 @@ static void GeneralDefaults(void)
 		vt->floorzset	= false;
 		vt->ceilingzset	= false;
 	}
-*/
+
 }
 
 /** Set map defaults in UDMF format.
@@ -1002,7 +1002,6 @@ static void TextmapVertex(UINT32 i, char *param)
 		vertexes[i].x = FLOAT_TO_FIXED(atof(M_GetToken(NULL)));
 	else if (fastcmp(param, "y"))
 		vertexes[i].y = FLOAT_TO_FIXED(atof(M_GetToken(NULL)));
-#ifdef ADVUDMF
 	else if (fastcmp(param, "zfloor"))
 	{
 		vertexes[i].floorz = FLOAT_TO_FIXED(atof(M_GetToken(NULL)));
@@ -1013,7 +1012,6 @@ static void TextmapVertex(UINT32 i, char *param)
 		vertexes[i].ceilingz = FLOAT_TO_FIXED(atof(M_GetToken(NULL)));
 		vertexes[i].ceilingzset = true;
 	}
-#endif
 }
 
 /** Auxiliary function for TextmapParse.
diff --git a/src/p_slopes.c b/src/p_slopes.c
index 89d265fa4..64f11eb72 100644
--- a/src/p_slopes.c
+++ b/src/p_slopes.c
@@ -508,6 +508,56 @@ static void line_SpawnViaVertexes(const int linenum, const boolean spawnthinker)
 	side->sector->hasslope = true;
 }
 
+/// Spawn textmap vertex slopes.
+void SpawnVertexSlopes (void)
+{
+	line_t *l1, *l2;
+	sector_t* sc;
+	vertex_t *v1, *v2, *v3;
+	size_t i;
+	for (i = 0, sc = sectors; i < numsectors; i++, sc++)
+	{
+		// The vertex slopes only work for 3-vertex sectors (and thus 3-sided sectors).
+		if (sc->linecount != 3)
+			continue;
+
+		l1 = sc->lines[0];
+		l2 = sc->lines[1];
+
+		// Determine the vertexes.
+		v1 = l1->v1;
+		v2 = l1->v2;
+		if ((l2->v1 != v1) && (l2->v1 != v2))
+			v3 = l2->v1;
+		else
+			v3 = l2->v2;
+
+		if (v1->floorzset || v2->floorzset || v3->floorzset)
+		{
+			vector3_t vtx[3] = {
+				{v1->x, v1->y, v1->floorzset == true ? v1->floorz : sc->floorheight},
+				{v2->x, v2->y, v2->floorzset == true ? v2->floorz : sc->floorheight},
+				{v3->x, v3->y, v3->floorzset == true ? v3->floorz : sc->floorheight}};
+			pslope_t* slop = Slope_Add(0);
+			sc->f_slope = slop;
+			sc->hasslope = true;
+			ReconfigureViaVertexes(slop, vtx[0], vtx[1], vtx[2]);
+		}
+
+		if (v1->ceilingzset || v2->ceilingzset || v3->ceilingzset)
+		{
+			vector3_t vtx[3] = {
+				{v1->x, v1->y, v1->ceilingzset == true ? v1->ceilingz : sc->ceilingheight},
+				{v2->x, v2->y, v2->ceilingzset == true ? v2->ceilingz : sc->ceilingheight},
+				{v3->x, v3->y, v3->ceilingzset == true ? v3->ceilingz : sc->ceilingheight}};
+			pslope_t* slop = Slope_Add(0);
+			sc->c_slope = slop;
+			sc->hasslope = true;
+			ReconfigureViaVertexes(slop, vtx[0], vtx[1], vtx[2]);
+		}
+
+	}
+}
 
 //
 // P_CopySectorSlope
@@ -561,6 +611,9 @@ void P_ResetDynamicSlopes(const UINT32 fromsave) {
 	slopelist = NULL;
 	slopecount = 0;
 
+	/// Generates vertex-based Textmap UDMF slopes.
+	SpawnVertexSlopes();
+
 	/// Generates line special-defined slopes.
 	for (i = 0; i < numlines; i++)
 	{
diff --git a/src/r_defs.h b/src/r_defs.h
index c3443724f..ad638410a 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -84,6 +84,8 @@ typedef struct extracolormap_s
 typedef struct
 {
 	fixed_t x, y, z;
+	fixed_t floorz, ceilingz;
+	boolean floorzset, ceilingzset;
 } vertex_t;
 
 // Forward of linedefs, for sectors.