Forklift pallet physics

Question

Hello,

What I have:

Forklift with a rigidbody and appropriate colliders
Forks that move through an animator with simulated physics on. The forks themselves have box colliders
Pallet with rigidbody and colliders
Physics materials
List item

Wood: dynamic: 0.8, static: 0.8, bouncy: 0 Metal: dynamic: 0.6, static: 0.6, bouncy: 0 - The forklift movement - List item

What the problem is: I can pick up the pallet just fine, but when I tilt my forks back. The pallet doesn't follow along as shown in the gif below. I have been trying to find an answer to this, but no luck so far. How do I go about fixing this issue?

EDIT: For those who would like to mess around in a project, I created a unity package which contains a dummy version of everything. Import the package, open the test scene and run it. Controls: arrow keys to move, L to move forks up, SHIFT + L to move forks down, M to tilt the forks, SHIFT + M to tilt in opposite direction.

Answer 1

Answer by Mr_Teels · Jan 10, 2020 at 04:56 PM

Try adding a "Physics Material" to the Palett and the BoxCollider. The standart PhysicsMaterial hat little to no friction...

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kevin_rmucan · Jan 13, 2020 at 08:17 AM 0

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Both have a physics material with frictions set to 1 (or higher), still sliding.

Answer 2

Answer by lgarczyn · Jan 12, 2020 at 02:07 PM

An animator with animate physics is only supposed to be used on kinematic objects. I'm surprised how well this works, but this might be the cause

I would recommend using a Joint to represent the forklift tilt and another for the elevator, and either script or animate the joint values.

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kevin_rmucan · Jan 13, 2020 at 08:31 AM 0

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The forks are kinematic but the pallet ain't.

lgarczyn kevin_rmucan · Jan 13, 2020 at 08:52 PM 0

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Damn, it should work then. Are you sure the forklift hotbox is not pushing against the pallet?

kevin_rmucan lgarczyn · Jan 14, 2020 at 12:14 PM 0

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I am sure yea. I uploaded a small package with the forklift recreated incase you want to experience it for yourself.

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Answer 3

Answer by Bunny83 · Jan 12, 2020 at 03:46 PM

Does your sliding "fork" gameobject has it's own rigidbody? If not you're violating basic rigidbody principles. If you lift and tilt that fork inside a single rigidbody object, it's no longer a rigid object.

Also make sure the physics material of your fork and your pallet colliders have a high friction value. Keep in mind that the frictionCombine value controls what actual friction value will be used. See PhysicMaterialCombine for more information.

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kevin_rmucan · Jan 13, 2020 at 08:29 AM 0

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If I add a rigidbody to the parent object of both forks or a separate rigidbody to each fork, it then acts weird too. But I ill try make a simplified forklift first, the model i received is kinda big and bad. I will get back to you when I have done this.

alt text (https://i.imgur.com/edETojo.gifv)

Forklift pallet physics

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