From 24edfb77afbb631cb83d26a095b609850f997e5c Mon Sep 17 00:00:00 2001
From: lhofhansl <lhofhansl@yahoo.com>
Date: Sun, 18 Dec 2016 21:43:04 -0800
Subject: [PATCH] Fix occlusion culling, again (#4930)

---
 src/clientmap.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/clientmap.cpp b/src/clientmap.cpp
index db71d4b57..faa1461f6 100644
--- a/src/clientmap.cpp
+++ b/src/clientmap.cpp
@@ -301,7 +301,10 @@ void ClientMap::updateDrawList(video::IVideoDriver* driver)
 			float endoff = -BS * MAP_BLOCKSIZE * 1.732050807569;
 			v3s16 spn = cam_pos_nodes;
 			s16 bs2 = MAP_BLOCKSIZE / 2 + 1;
-			u32 needed_count = 1;
+			// to reduce the likelihood of falsely occluded blocks
+			// require at least two solid blocks
+			// this is a HACK, we should think of a more precise algorithm
+			u32 needed_count = 2;
 			if (occlusion_culling_enabled &&
 					// For the central point of the mapblock 'endoff' can be halved
 					isOccluded(this, spn, cpn,