An example and comparison between conventional planar vertex normals and procedural normals from converting object-relative normals into tangent space.
The right tree in the images uses the old conventional vertex normals, and the left is using the procedural.
The procedural normal construction approach creates the illusion of a volumetric foliage where there are actually just two-dimensional planes. The procedural normals are blended with the bitmap normals used for each plane.
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