From 623fc8c73de35bef0785f09bae8a3f607f8ed087 Mon Sep 17 00:00:00 2001
From: Wolfgang Draxinger <Wolfgang.Draxinger@draxit.de>
Date: Fri, 27 Apr 2012 20:43:08 +0200
Subject: qt_terr - a simple quadtree based terrain renderer with LOD

---
 samples/OpenGL/qt_terr/terrain.cpp | 43 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 samples/OpenGL/qt_terr/terrain.cpp

(limited to 'samples/OpenGL/qt_terr/terrain.cpp')

diff --git a/samples/OpenGL/qt_terr/terrain.cpp b/samples/OpenGL/qt_terr/terrain.cpp
new file mode 100644
index 0000000..d08d345
--- /dev/null
+++ b/samples/OpenGL/qt_terr/terrain.cpp
@@ -0,0 +1,43 @@
+#include "terrain.h"
+
+Terrain::Terrain()
+{
+	z_mean=0.0;
+}
+
+void Terrain::split()
+{
+	if(is_split())
+		return;
+
+	quads[0][0] = new Terrain(V);
+	quads[0][1] = new Terrain(V);
+	quads[1][0] = new Terrain(V);
+	quads[1][1] = new Terrain(V);
+
+	quads[0][0]->set_range(x1, x_mid, y1, y_mid);
+	quads[0][1]->set_range(x_mid, x2, y1, y_mid);
+	quads[1][0]->set_range(x1, x_mid, y_mid, y2);
+	quads[1][1]->set_range(x_mid, x2, y_mid, y2);
+}
+
+void Terrain::track_down(double x, double y, double nz, int levels)
+{
+	if(levels>0)
+	{
+		int a=(x<x_mid)?0:1;
+		int b=(y<y_mid)?0:1;
+
+		if(!is_split())
+			split();
+
+		quads[b][a]->track_down(x, y, nz, levels-1);
+	}
+	else
+	{
+		z[0][0]=
+		z[0][1]=
+		z[1][1]=
+		z[1][0]=z_mean=nz;
+	}
+}
-- 
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