Open 7 days is an open-source engine based on some of the technology behind the popular game 7 days to die. Right now, the engine is in a super early stage, so when looking at the code, keep in mind that 99% of it is temporary and will be cleaned up in the future!
The plan behind Open 7 Days is to eventually utilize the engine to create a game within in the same vein of 7 days to die. Right now, this is quite a far away plan but hopefully this will start being developed within the next few months.
Right now, because the engine is in such an early stage, I advice you against actively working on it. Of course, if you see anything you see could be improved, feel free to open an issue / submit a request.
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Procedurally generated terrain with marching cubes
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Cascaded exponential shadow maps
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Indirect diffuse lighting powered with cascaded voxel ray-tracing
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Indirect specular lighting with screen-space + cube map raytracing
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Screen-space-refractions
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Basic water rendering