Object Bind - Same Element Only

[walterlee]

I think what he means may be that when a particle represents motion in an object, it cannot cross the element and will always be locked on the initial position element.

For example, an object has two elements, namely a and B. Particles are distributed on two elements at birth. Then he hopes that when the particles move on the two element surfaces, the particles born at the position of element a will not cross the surface of element B. Particles at the position of element a will only move on the surface of element a, and particles at the position of element B will always move on element B.

Is there a solution to the situation you said?