  Classical good continuation for image curves is based on $2D$ position and
orientation. It is supported by the columnar organization of cortex, by
psychophysical experiments, and by rich models of (differential) geometry. Here
we extend good continuation to stereo. We introduce a neurogeometric model, in
which the parametrizations involve both spatial and orientation disparities.
Our model provides insight into the neurobiology, suggesting an implicit
organization for neural interactions and a well-defined $3D$ association field.
Our model sheds light on the computations underlying the correspondence
problem, and illustrates how good continuation in the world generalizes good
continuation in the plane.
