Objects rotating after falling on another object with Physics & Gravity?

Question

How can I have a realistic physic effect with gravity so that when the object falls on a slope, it will also rotate depending on the slope.

For example. here is what I want to happen: alt text

But this is what's happening with my current setup: alt text

Here is my component setup for the **blue box object** that is falling on the red slope.

And here is my component setup for the **red slope** that the blue box object is falling on.

Is there anything I need to do for this to happen?

If so, what is it? And how?

Google doesn't help, probably because I didn't know what to search for in the first place, I don't know what this certain problem is called.

Thanks!

EDIT:

And yeah, it slides down without rotating.

And it seems to only happen when I put the collider and the rigidbody on their parent. My object has a lot of 3d parts and it's all on 1 parent. When I put the collider and rigidbody on the parent, it does that. But when I put the collider and rigidbody on only one part (one of the child), it does what I wanted.

I could put a rigidbody and collider on every child, but when it falls, it makes all of them get seperated to each other. I want them to stick together and fall as I want them to fall.

How do I this?

Thanks :)

Answer 1

Best Answer

Answer by Lylek23 · Jun 28, 2014 at 08:53 PM

When the box hits the slope does it just stick there, or does it slide down without rotating? You don't have a character controller on it, do you? And you shouldn't need a rigidbody on the slope.

Try creating a new scene. Add a plane, and angle it for a slope. Add a cube, and give it a rigidbody. You shouldn't need to adjust anything. Position the cube above the plane and press play, and it should tumble down the hill.

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Owen-Reynolds · Jun 28, 2014 at 10:10 PM 0

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To repeat, the normal Unity set-up gives the effect you want. The blue box should bounce a bit, tip over, maybe start to flip over, but rock back, slide .... . It should look pretty good (depending how far it falls.) No matter what, it should always tip sideways.

Making it "do a road runner," like your 2nd picture set, takes more work.

Just recheck the set-up, or make a bare minimum. Maybe the red plane has the box collider flat, not tilted ... .

Leroterr · Jun 29, 2014 at 04:18 AM 0

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It slides down without rotating. And yeah, I don't have a character controller on it.

I'll try removing the rigidbody on the slope.

Thanks!

Leroterr · Jun 29, 2014 at 04:34 AM 0

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It seems to only happen when I put the collider and the rigidbody on their parent. My object has a lot of 3d parts and it's all on 1 parent. When I put the collider and rigidbody on the parent, it does that. But when I put the collider and rigidbody on only one part (one of the child), it does what I wanted.

I could put a rigidbody and collider on every child, but when it falls, it makes all of them get seperated to each other. I want them to stick together and fall as I want them to fall.

How do I this?

Thanks :)

Lylek23 · Jun 29, 2014 at 04:55 AM 0

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Well, I'm not exactly sure "how you want them to fall", or what your set up is, and what all is falling where. Can you explain more?

Kiwasi · Jun 29, 2014 at 06:45 AM 1

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Unity gets weird when rigidbodies are parented to each other. Avoid this at all costs. You can achieve the same affect of parenting by using joints.

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Objects rotating after falling on another object with Physics & Gravity?

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