SoBlock is a sparse voxel octree block building game. So it's like minecraft, but you can see the whole map (no fog) and build/destroy with arbitrarily large blocks. The blocks that are far away are rendered coarser so that the whole map fit in memory.
Here is a video of what it looks like:
It is written in Java and uses LWJGL for interfacing with OpenGL.
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Get Eclipse and Java 1.6 and figure out how to make eclipse to work with Java 1.6.
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Clone this repo
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Import project from eclipse with file -> import -> general -> existing project into workspace
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Laucnh
If you just want to play SoBlock you can download compiled version at