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OpenWorld: A graphics project

This is a graphics project for the course Computer Graphics held by Ingemar Ragnemalm at Linköping University, Sweden during 2017. The project aimed at generating open worlds, which was not completely successful, but many basic and intermediate graphics features were implemented. Read the paper for an elaborate report of the project. OpenGL context is provided by MicroGlut.

Dependencies

  • OpenGL (version >= 4.2)
  • OpenCV (2 or 3)
  • curl
  • glm (if not installed on system it is available as a submodule)
  • fftw3 (downloaded in make, or can be installed on system)

Installation

  • On debian
    • apt-get install libgl1-mesa-dev libxt-dev libopencv-dev curl
  • git submodule init
  • git submodule update (wait for clone to finish)
  • make (will download fftw3 using curl if not installed on system).

Make will not try to install the dependencies under system directories, they will only be installed locally in the project folder.

Project structure

  • Source files are located under src
  • Deprecated test files are located under src/slask and src/unsupported
  • Common library functions are located under src/lib
  • GLUT is located under common (Ingemar Ragnemalm version)
  • Other external dependencies are located under ext
  • Shaders are located in shaders
  • Deprecated test shaders are located in shaders/slask and shaders/unsupported
  • Scripts are located under scripts
  • Documentation is located under doc
  • Textures are located under data/textures
  • Recorded data are located under data/record
  • Build files are located under build

Running the project

There are various controls implemented, all listed below

  • 1 - Decrease shadow map margin
  • 2 - Increase shadow map margin
  • 3 - Decrease shadow map filter kernel size, minimum 0
  • 4 - Increase shadow map filter kernel size, unbounded so can be very slow for big sizes
  • 5 - Decrease water alpha (reflectivity), minimum 0
  • 6 - Increate water alpha ( reflectivity), maximum 1
  • 7 - Decrease geomipmap base resolution, minimum 0
  • 8 - Increase geomipmap base resolution, unbounded so can be slow for big values
  • 9 - Decrease current time by 6 minutes
  • 0 - Increase current time by 8 minutes
  • w,a,s,d + Mouse - Classic move controls
  • f - Toggle fullscreen
  • q - Quit
  • z - Toggle wart pointer
  • c - Toggle camera fly mode
  • Space - Move fast
  • Return/Enter - Take picture (data/record/)
  • m - Toggle shadows
  • m - Toggle shadow map debug mode (render shadow map)
  • p - Toggle particles
  • r - Toggle Rayleigh scattering
  • t - Toggle Mie scattering
  • y - Toggle clouds
  • u - Toggle cloud perspective correction
  • i - Toggle cloud horizon fog
  • g - Toggle gloss mapping
  • n - Toggle normal mapping
  • v - Toggle tangent basis visualization
  • l - Toggle blinn-phong vs phong specular shading

Known bugs

  • Changing the time while particles being rendered gives rise to weird effects. Toggling particles after changing time resolved the problem.
  • The calculation of barycentric coordinates for moving camera in ground mode has some bug when moving over triangle borders.

External resources

Textures have been used from textures.com, all credits for the textures goes there.