Creating and Editing Texture Coordinates (UVs) - An Introduction to Computer Graphics for Artists - page 165

Fig. 10.27 By rearranging the UVs from the interrupted mapping solution in Fig. 10.23 , the
texture space is used more effi ciently
Fig. 10.28 Trans-spherical projection uses two projection spheres at perpendicular angles to each
other to reduce polar distortion and the number of seams
two spheres for the projection matrices, one of which is rotated perpendicularly to
the other (Fig. 10.28 ). This allows the rotated sphere to be used as the reference for
the maximum area of distortion on the other sphere and vice versa. After the UVs
have been projected, they can be stitched together (Sect. 10.5 ) to reduce the number
of seams even more. The UVs may be stretched to fi t the legal UV space, provided
that the texture map is non-proportionately scaled to match. Otherwise, the map will
appear to have been squashed.