Border alignment artifact

When rotating a cube, the cube representing the rotated particle will have some areas where there is no information.

See the effect here:

u1=dynamo_rot(rand(64,64,64),[45,45,45]); % rotates creating a spherical halo

u2=dpkgeom.rotation.sharpRot(rand(64,64,64),[45,45,45]); % rotates creating an edge

figure;

subplot(1,2,1);dslices(u1);subplot(1,2,2);dslices(u2);