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Question by DanJC · Mar 21, 2013 at 05:35 AM · physicsterraingravityconnectionslope

How do I make my object follow the ground perfectly?

If I have a piece of hilly terrain, how can I make my character slide over that ground perfectly, never letting go? I would like this to still be using Unity's physics engine, even to the point of gravity affecting motion up a slope, but not to the point of ever removing the character from the surface.

Just looking for a confident lead to follow up, not specific instructions.

Cheers

Edit - Clarifying: The terrain will be not only hilly, but also with walls, overhangs and ceilings. So while travelling on a wall, gravity will feel normal and pull the player down the wall's surface, but not off the wall. While travelling upside down on a ceiling, gravity will have nowhere to pull the character - neither along the ceiling nor off of it - and the character will remain connected to the ceiling.

If anyone knows James Pond 3, pretty much exactly that.

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avatar image DanJC · Mar 22, 2013 at 01:01 PM 0
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Well gravity is still an important value, so that would create issues. I updated the OP to be more clear.

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Answer by gribbly · Mar 21, 2013 at 08:04 AM

I would use physics. Do something like:

  • Go to project settings and set gravity to be much higher than normal (normal is -9.8m/s in the y axis)

  • Use really low friction between character and terrain (so you can slide)

  • Constrain rotations (so physics is used for translation, but your character can't tip over)

  • And possibly add some script to zero out rigidbody.velocity.y every frame (e.g., in FixedUpdate()).

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