3D Nature Environment with Procedurally Generated Terrain and Trees

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Build

This program uses premake4 as the cross-platform build system. First you will need to build all the static libraries that the projects depend on. To build the libraries, open up a terminal, and cd to the top level of the project directory and then run the following:

$ premake4 gmake
$ make

This will build the following static libraries, and place them in the top level lib folder of the project directory.

• libcs488-framework.a
• libglfw3.a
• libimgui.a

I have added libSOIL.a to this folder. This may work out of the box, or you may need to manually install SOIL on your machine.

Next we can build the actual project. To do this, cd into the src/ directory and run the following terminal commands in order to compile the A5 executable using all .cpp files in the src directory:

$ cd src/
$ premake4 gmake
$ make

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Other Resources

• grass.png

  • copyright Blender Foundation | apricot.blender.org

• water.png

  • retrieved from http://opengameart.org/content/3-live-proceduraly-generated-tiling-water-textures-512px-running-brushes

• skybox textures

  • created by Zachery "skiingpenguins" Slocum
  • retrieved from http://opengameart.org/content/skiingpenguins-skybox-pack

• bark.png

  • created by Bart. K
  • retrieved from http://opengameart.org/content/seamless-tiling-tree-bark-texture

• sgrass5-1.png, sgrass5-3.png

  • created by virtushda
  • retrieved from http://opengameart.org/content/grass-2-0

• leaf.png

  • retrieved from http://www.textures.com/download/leaves0120/27993

• stone.png

  • created by hornpipe2
  • retrieved from http://opengameart.org/content/gray-stone-mountaincliff

• snow7_d.jpg

  • created by tomek
  • retrieved from http://opengameart.org/content/tomeks-seamless-snow-textures

• sand.png

  • created by n4
  • retrieved from http://opengameart.org/content/seamless-beach-sand

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Dependencies

• OpenGL 3.2+
• GLFW
  • http://www.glfw.org/
• Lua
  • http://www.lua.org/
• Premake4
  • https://github.com/premake/premake-4.x/wiki
  • http://premake.github.io/download.html
• GLM
  • http://glm.g-truc.net/0.9.7/index.html
• ImGui
  • https://github.com/ocornut/imgui
• Simple OpenGL Image Library
  • http://www.lonesock.net/soil.html

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Original Objectives

1. UI: Implement a first-person camera with associated controls to allow navigation of the scene, including movement in 3 axes, speed adjustment, and camera rotation

2. Modelling: Add a skybox to the scene using cube mapping

3. Implement reflections for water using OpenGL's stencil buffer

• I implemented skybox reflections on the water instead

4. Generate a pseudo-random terrain heightmap with Perlin noise

5. Add grass to the scene using billboards to create the illusion of many blades of grass

6. Add texture to the ground and foliage using texture mapping

7. Use L-systems to procedurally generate trees

8. Implement shadows using a depth map stored in an OpenGL frame buffer

9. Implement bloom using framebuffers and Gaussian blur

10. Use a 'screen-door' effect to simulate alpha transparency for grass