From 0f2f4ee8f911197c3a36737f908c06c494fea0e5 Mon Sep 17 00:00:00 2001
From: Andrzej Kapolka <drzej.k@gmail.com>
Date: Mon, 20 May 2013 11:32:32 -0700
Subject: [PATCH] Add the discussed four lines to disable blending and enable
 backface culling.

---
 interface/src/VoxelSystem.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/interface/src/VoxelSystem.cpp b/interface/src/VoxelSystem.cpp
index a3796f68c1..d578bb3504 100644
--- a/interface/src/VoxelSystem.cpp
+++ b/interface/src/VoxelSystem.cpp
@@ -638,11 +638,18 @@ void VoxelSystem::render() {
     _perlinModulateProgram->bind();
     glBindTexture(GL_TEXTURE_2D, _permutationNormalTextureID);
 
+    // for performance, disable blending and enable backface culling
+    glDisable(GL_BLEND);
+    glEnable(GL_CULL_FACE);
+
     // draw the number of voxels we have
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _vboIndicesID);
     glScalef(TREE_SCALE, TREE_SCALE, TREE_SCALE);
     glDrawElements(GL_TRIANGLES, 36 * _voxelsInReadArrays, GL_UNSIGNED_INT, 0);
 
+    glEnable(GL_BLEND);
+    glDisable(GL_CULL_FACE);
+
     _perlinModulateProgram->release();
     glBindTexture(GL_TEXTURE_2D, 0);