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ARKitでシーンの重力を変更する方法

やりたいこと

ARKitでオブジェクトの落下スピードを変更する方法を調べました。

シーン内の重量を変更する

シーン内の重力を変更する方法です。gravityプロパティでX、Y、Z軸に対して変更を加えます。

// Y軸方向に重力を増減せたい値を設定する
sceneView.scene.physicsWorld.gravity = SCNVector3(0, -0.1, 0)

SCNPhysicsWorld

まとめ

重力変更以外にオブジェクトの落下スピードを変える方法として、オブジェクトの空気抵抗を変更するやりかたもあります。
場合によって使い分ければいいかと思います。

// 空気抵抗の値を変更する
scnNode.physicsBody?.damping = 1

SCNPhysicsBody

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