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Some experiments with realtime water & erosion simulation on heightfield terrains, using OpenGL 4.3.

Technology, How stuff works

Basics

• C++11 (using mainly Visual Studio 2013
• OpenGL 4.3

Dependencies

• trunk version of ezEngine (also taking a minor part into its development) ** Used for File IO, Memory Management, Basic Math, Window creation, Input, ...
• GLU
• AntTweakBar

Simulation

Water Simulation

Heightfield water: "Column base Water simulation" -> Water in column, each column connected to 4 neighbors with "virtual pipes". Outgoing flow in each of the 4 directions is saved per heightfield-pixel. Idea relatively good explained and why the outgoing-flow thing is so important can be found here. While being not very detailed Theses slides can give a very good overview what this is all about.

Erosion Simulation

(todo: Short explanation, give some references)

Rendering

Terrain Rendering

(todo: Short explanation, give some reference

Water Rendering

(todo: Short explanation, give some references)

Sky Rendering

Cheap gradient rendered with fullscreen triangle after everything else (todo)

Notes on Code

• Using some fancy C++11 feature
• Renderer is based on some gl wrapper classes that are not meant to abstract OpenGL but just to make things easier

Todo/Planned Features

(List not complete, mostly a memory aid to my self)

Rendering

• Implement visible Waterflow like described here
• Athmospheric Scattering

Simulation

• Fancy erosion stuff
• Water Spray?
• Moar sliders

Misc

• Moar sliders
• More OpenGL wrapper stuff