Voraca

Volume raycasting powered by OpenGL 3.3 core profile. This project was part of my bachelor thesis in 2014!

Features

• Loading of DAT and PVM (uncompressed) files
• Realtime manipulation of 2D transferfunction via mouse
• Bezier curve interpolation between set points in transferfunction
• Multiply shading parameters per point in transferfunction
• Local lighting via sun
• Acceleration techniques (Early Ray Termination, Empty Space Skipping...)
• Spherical reflection
• Volume clipping with box
• Launch file, transferfunction and raycaster settings can be saved as XML

Screenshot

Videos

• Showcase: Part 1
• Showcase: Part 2
• Tutorial: Import DAT

HowTo

Just run CMake to create a project for your IDE and compile it. Should work on Windows and Linux with OpenGL 3.3 core profile compatible graphics hardware. Tested under:

• Windows 10, Visual Studio 2015, 64bit project, AMD Radeon HD 7950
• Arch Linux, GCC 5.x, 64bit project, Nvidia Geforce 860m running with optirun

Dependencies

• GLM: http://glm.g-truc.net/0.9.7/index.html (MIT license chosen)
• picoPNG: http://lodev.org/lodepng
• GLFW3: http://www.glfw.org
• AntTweakBar 1.16: http://anttweakbar.sourceforge.net (included in externals but renamed gitignore to upload binaries)
• RapidXML 1.13: http://rapidxml.sourceforge.net (Boost Software License chosen)

TODO

• Warnings in GCC (all about char* conversion)
• Does not render correctly on linux with intel gpu
• 32bit support for Windows / Visual Studio
• Importance volume does not use complete information of volume if volume resolution % downscale !=0
• Histogram is one pixel too wide
• Shader::draw line 174: Reset of textureSlotCounter only works as expected if all textures assigned once or all textures assigned each frame. Mixing would break it.

Acknowledgements

• Thanks to Andre Taulien for supporting in the Linux compatibility!
• Thanks to Nils Höhner for supporting in the MacOS compatibility! (not given right now)