In the TriplanarProjection material function, the final Normalize operation under the "Weigths computation" comment section is not correct according to the reference paper at http://transvoxel.org/Lengyel-VoxelTerrain.pdf, causing visual artifacts over the blending area (brighter seams). To fix, you just divide by the sum of the components, instead of using Normalize.
In the TriplanarProjection material function, the final Normalize operation under the "Weigths computation" comment section is not correct according to the reference paper at http://transvoxel.org/Lengyel-VoxelTerrain.pdf, causing visual artifacts over the blending area (brighter seams). To fix, you just divide by the sum of the components, instead of using Normalize.