Parametric tests for surface-surface intersections.

[jbrezmorf]

Implement a parametric test:

• takes a function f(x,y) and two intersecting planes:
  z=p(x,y) # this can be fixed to Z=0 plane
  z=q(x,y) # this plane can be arbitrary

• assume plane intersection at line r, parametric x,y = r(t)

• we compute function g(x,y) = f + q

• We transform a set of points zi = g(xi, yi) to an arbitrary different coordinate system UVW

• Create two surfaces as approximations to the point clouds.

• compute intersection curve and compare it to g(r(t))

• combine different choices of: function f, plane q, coordinate system UVW