As the subject says it, the Orthogonal 3D Engine link is dead. Might want to update the link or remove the tutorial.
By the way, if this was mentioned already...
Dead link on Orthogonal 3D Engine tutorial
Dead link on Orthogonal 3D Engine tutorial
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Yeah, it has been backed up on the irrlicht3d.org wiki however, so it wouldn't be hard to simply change the link.
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