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Usually, blocks becomming passable is because they are too small or too large.

Surface too big means exactly that. The surface is too big for shaded lighting. You can either switch it to flat-shaded, and have no shadows. Or, you can divide the block into smaller sections...

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That's weird, since i have larger blocks that are not passable.
I'll try it anyway, thanks for the hint


By the way, is there anyway to cut a block in two, without having to carve with another block? Like a knife tool for example.