Detecting collisions between fingertip and world mesh

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Created Oct ’24

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I'm using hand tracking to detect collisions between fingertips and entities that I have placed in the scene. I'm using the .mixed environment.

However, I want to detect when a fingertip touches a real-world object such as a wall.

No matter what I try, I can't get the collision to fire. I'm using the SceneReconstructionProvider to give me world meshes, which I use to create ModelEntity objects to which I add a CollisionComponent with the shape of the object.

I can render the meshes just fine, but nothing I do seems to allow collisions to work.

Surely this is possible, what am I missing?

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Answer 1

rkeniger OP

Oct ’24

Accepted Answer

I found the solution here.

You need to allow static entities (i.e. the world mesh) to trigger collisions with kinematic entities (i.e. the fingertip entity). You do this by adding a physics simulation component to a parent entity (i.e. the root entity of your scene) and setting the appropriate collision option.

var physicsSim = PhysicsSimulationComponent()
physicsSim.collisionOptions.insert(.reportKinematicVsStatic)
contentEntity.components.set(physicsSim)

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Answer 2

rkeniger OP

Nov ’24

Oh - I love this. Thank you for sharing @JoonAhn.

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