3d meshes - Smooth mesh from voxel grid - Game Development Stack

Im trying to implement smooth voxel grid meshing using marching cubes algorithm but I dont quite understand how to do the interpolating (I understand that this would solve the problem) to achieve the

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unity - Texturing different block types on an optimized voxel mesh - Game Development Stack Exchange

Tutorials — gradientspace

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Looking for information on using voxels - Unity Forum