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Smooth lighting: Fix light leaking through edge-connected corners
For solid nodes, the lighting at a corner becomes face-dependent, which means that only the four nodes in face-direction contribute to the lighting (getSmoothLightSolid). For special nodes, which use the lighting values at the eight corners of a node, the lighting is not face-dependent, but certain nodes of the eight surrounding nodes of a corner (here indices 4, 5, 6 and 7) can be obstructed. Ambient occlusion now also occurs for solid nodes, if two, three or four of the four nodes in face-direction are solid.
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