This tutorial demonstrates how to perform morphing between
two surfaces using the distance field.
Cassiopee/Onera morphing by C. Benoit.
To perform morphing between two given surfaces, the idea
is to use the distance field. We first compute a uniform
Cartesian grid around both given surfaces.
We then compute the distance field for
first surface (Dist1) and for second surface (Dist2)
by using Dist2Walls.distance2Walls
on the uniform Cartesian grid. Intermediate distance fields
are computed by linear interpolation of the two distance fields
Dist1 and Dist2. Intermediate surface is reconstructed
by marching cubes (using P.isoSurfMC).
