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Question by itjunk · Jun 22, 2014 at 01:04 PM · rigidbody2dgravityplatformkinematic

Avoid moving platform pushing falling object

I have an object with a Rigidbody2D affected by gravity, that falls on to platforms. The platforms are kinematic but can be moved left or right (I'm currently doing this with rigidbody2D.MovePosition in FixedUpdate). The problem is, if the platform is moved into the side of the falling object, the object will be pushed to the side (green path on image). Any ideas how to avoid the object being moved (keep the same x position) and block the platform movement? alt text

Edit: To be clear, the object should also be able to land and stay on the platform and not move with the platform when it is moved (which works as it is now).

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avatar image AlucardJay · Jun 22, 2014 at 01:40 PM 0
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Use layers. Have the objects on specific layers and use the collision matrix to ignore collisions between those layers

  • http://docs.unity3d.com/$$anonymous$$anual/Layers.html

  • http://docs.unity3d.com/$$anonymous$$anual/LayerBasedCollision.html

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Answer by haim96 · Jun 22, 2014 at 01:29 PM

well, you could change the collider to trigger and fire "onTriggerEnter2D" event to stop the platform movement...

in case that someone will ask, trigger is preferred so it wan't be effected by the platform movement and wan't be pushed by it.

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avatar image itjunk · Jun 22, 2014 at 01:42 PM 0
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Thanks! But the object should also be able to land and stay on the platform (sorry for being unclear on that), so changing it to a trigger wouldn't really work? $$anonymous$$aybe detecting a collision and doing something from there could somehow be useful though.

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