how to change physics material of a colider in runtime

Question

hello I was wondering if I can change the physics material of an object's colider. for example, changing it from metal to bouncy. is it even possible?

Answer 1

Best Answer

Answer by Robotron18 · Nov 08, 2010 at 11:02 AM

You can pre-create the desired material in the editor Unity or use available in "Assets/Standard Assets/Physic Materials". Then place it into "Assets/Resources/PhysicMaterials". And for runtime change:

gameObject.collider.material = (PhysicMaterial)Resources.Load("PhysicMaterials/Wood");

Use the following code to assign when you import resources:

public void OnPostprocessModel(GameObject importedObject)
{
    CapsuleCollider capColl = importedObject.AddComponent<CapsuleCollider>();
    capColl.material = (PhysicMaterial)Resources.Load("PhysicMaterials/Wood");
}

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Cnotey · Dec 08, 2011 at 07:54 AM 0

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This doesn't seem to work for me. I keep getting an error message saying the editor is expecting a semicolon on line 78, which ends up being in between the E and the S in the word Resources.

Anyone have any ideas?

Answer 2

Answer by Eric5h5 · Apr 01, 2010 at 05:44 PM

Yes, you can change collider.material, by either assigning a PhysicMaterial:

var myMaterial : PhysicMaterial;

function Start () {
   collider.material = myMaterial;
}

or changing individual properties (collider.material.bouncyness, etc.).

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Answer 3

Answer by sathya _m · Oct 31, 2013 at 12:46 PM

In c#

this.collider.material=new PhysicMaterial("Wood");

But don't forgot we need to refresh rigidbody for applying changes.

before change: rigidbody.isKinematic = true ; rigidbody.Sleep();

after change: rigidbody.isKinematic = false ; rigidbody.Wakeup();

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Answer 4

Answer by KvanteTore · Apr 01, 2010 at 05:51 PM

Yes, that is possible. You can set the active PhysicMaterial by setting collider.material. To make sure that the materials are included in the scene, you can create an array of PhysicMaterials which you set at design time

Make a public array of PhysicMaterials in the class

public PhysicMaterial materials[]

If you fill this list from the inspector in the Unity editor, you can then assign one of the materials at runtime:

collider.material = materials[i]

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Answer 5

Answer by Vadelma · Oct 13, 2010 at 09:38 PM

Be careful if you decide to change the properties of a PhysicMaterial object at runtime instead of/without changing the sharedMaterial (or material) property of the colliders using it. In some cases, the physics engine will continue to use the old properties of a PhysicMaterial object. See this forum post of mine for more information.

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how to change physics material of a colider in runtime

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