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Set physics shape in script

Discussion in 'Physics for ECS' started by MadboyJames, Oct 14, 2019.

  1. MadboyJames

    MadboyJames

    Joined:
    Oct 28, 2017
    Posts:
    262
    I have an archetype that needs to be able to receive raycasts. The renderMesh for this archetype is a small quad, so I'm trying to get a collision box to cover it. I don't have much specifics about my process because I just couldn't find anything on how to do this. I did notice that PhysicsShape is a class and not an IComponentData, so I don't think I can use it in a SetComponentData method. Do I have to convert a gameobject to an entity to get the collision mesh?

    Any help is appreciated.
     
  2. steveeHavok

    steveeHavok

    Joined:
    Mar 19, 2019
    Posts:
    481
    PhysicsShape is a design time component for use in the editor. As part of the Unity Physics conversion system the data in the PhysicsShape is used to create a number of IComponentDatas. The specific IComponentData you are looking for is PhysicsCollider. You can create a BoxCollider for example as follows:

    Code (CSharp):
    1.         BlobAssetReference<Collider> collider = BoxCollider.Create(new BoxGeometry
    2.         {
    3.             Center = float3.zero,
    4.             Orientation = quaternion.identity,
    5.             Size = new float3(1.0f, 1.0f, 1.0f),
    6.             BevelRadius = 0.05f
    7.         });
    8.         var colliderComponent = new PhysicsCollider { Value = collider };
    9.         entityManager.AddComponentData(entity, colliderComponent);
    10.  
    The BasePhysicsDemo.cs script (used by the Test scenes in the UnityPhysicsSamples) is a good starting point for code based creation of physics objects.