  We develop a theory for non-planar interaction between two identical type I
spatial solitons propagating at opposite, but arbitrary transverse angles in
quadratic nonlinear (or so-called chi(2)) bulk media. We predict quantitatively
the outwards escape angle, below which the solitons turn around and collide,
and above which they continue to move away from each other. For in-plane
interaction the theory allows prediction of the outcome of a collision through
the inwards escape angle, i.e. whether the solitons fuse or cross. We find an
analytical expression determining the inwards escape angle using Gaussian
approximations for the solitons. The theory is verified numerically.
