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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?

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  • \$\begingroup\$ Have you tried increasing friction and/or changing the mass of the bodies you don't want to be "pushed"? \$\endgroup\$ – Eran Boudjnah Dec 28 '13 at 20:18
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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
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