Abstract: Methods and apparatus to encode and/or decode normals of geometric representations of surfaces are disclosed herein. An example method includes receiving a plurality of points, each point representing a normal to the surface and being arranged within a tile; generating a plurality of regions within the tile, each region including points of the plurality of points; retrieving a first and second point, the first point representing a first normal and the second point representing a second normal, the first point being outside of a specified baseline region; performing a point transformation operation on the first point to produce a transformed first point of the baseline region and performing the point transformation on the second point to produce a transformed second point; generating a difference between the transformed first point and the transformed second point to produce a difference value; and encoding the difference value.

Abstract: Methods and apparatus to encode and/or decode normals of geometric representations of surfaces are disclosed herein. An example method includes receiving a plurality of points, each point representing a normal to the surface and being arranged within a tile; generating a plurality of regions within the tile, each region including points of the plurality of points; retrieving a first and second point, the first point representing a first normal and the second point representing a second normal, the first point being outside of a specified baseline region; performing a point transformation operation on the first point to produce a transformed first point of the baseline region and performing the point transformation on the second point to produce a transformed second point; generating a difference between the transformed first point and the transformed second point to produce a difference value; and encoding the difference value.