How to make box2d bodies block each other but not push each other?

Question

I want to use box2D to create a movement system for an RTS game. How can I make bodies block the movement of other bodies while preventing these bodies from pushing each other?

Answer 1

It sounds like you want standard collision detection, but a custom collision response. Sensors (Fixtures subsection 6.3) provide that functionality.

1. Disable the default collision (use static bodies, filtering, etc.)
2. Attach a sensor and implement a custom collision response