From 2abf1644a443e72bff06ee5afb68527a2850ff57 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@zdoom.fake>
Date: Sun, 15 Jun 2014 10:18:46 +0200
Subject: [PATCH] - fixed: Plane height changes only updated the first buffered
 vertex for the respective plane.

---
 src/gl/data/gl_vertexbuffer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/gl/data/gl_vertexbuffer.cpp b/src/gl/data/gl_vertexbuffer.cpp
index 8093a57a0e..559131d36e 100644
--- a/src/gl/data/gl_vertexbuffer.cpp
+++ b/src/gl/data/gl_vertexbuffer.cpp
@@ -294,7 +294,7 @@ void FFlatVertexBuffer::UpdatePlaneVertices(sector_t *sec, int plane)
 	secplane_t &splane = sec->GetSecPlane(plane);
 	FFlatVertex *vt = &vbo_shadowdata[startvt];
 	FFlatVertex *mapvt = &map[startvt];
-	for(int i=0; i<countvt; i++, vt++)
+	for(int i=0; i<countvt; i++, vt++, mapvt++)
 	{
 		vt->z = splane.ZatPoint(vt->x, vt->y);
 		if (plane == sector_t::floor && sec->transdoor) vt->z -= 1;