This is an implementation of the algorithm described in "Multi-resolution Terrain Rendering Using Summed-Area Tables".

Requirements
1.Our demo has been tested on Windows 7/10 platforms with Nvidia Geforce 1080Ti GPU. The RAM of the computer would be recommended for 8/16 GB.
2.We develop these codes with C++ and OpenGL on the Microsoft Visual Studio 2017.
3.We use CMake to set the environments of our codes.

Quickstart
Download Terrain Data:
1. Download https://drive.google.com/file/d/15AOcK8hyQrmJJiwIErNMNe0FurP25jc6/view?usp=sharing
2. Unzip the "data.rar" file and put the data in the "terrain_sat/Large_Terrain" directory. The terrain data directory path is "terrain_sat/Large_Terrain/data" (For example, the path of the first chunk in this directory is terrain_sat/Large_Terrain/data/000f0000").

Compile and Build
1. command: git clone https://github.com/Paul0927/terrain_sat.git
2. command: cd terrain_sat
3. command: mkdir build (The new directory path: terrain_sat/build)
4. command: cd build
5. command: cmake ../ -A x64 -DCMAKE_BUILD_TYPE=Release -G "Visual Studio 15 2017"
6. Open "Large_Terrain.sln" in the "build" directory and set the environents with "Release" and "x64".
7. Click the "Debug" button in the the Microsoft Visual Studio 2017.

Run
1.You can also directly run our demo in the "bin" directory, only if you copy the download terrain data to this directory (terrain_sat/bin/)

Camera control:
Key W: front
Key A: Left
Key D: right
Key S: back
Key C: bottom
Key Space: up

The initial scene will be the representative images, and also Figure 4, 7(bottom) in our paper.