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ViewsSceneKit – Node with animated skeleton not moving
I have a SceneKit app with 2 .scn files in the art.scnassets folder. The base ship.scn that comes with the project, and a new file orcIdle.scn that I added myself.
When I call this code on this ship, it moves it properly:
self.myScene = SCNScene(named: "art.scnassets/ship.scn")!
// Set the scene to the view
let ship = (myScene.rootNode.childNode(withName: "ship", recursively: false))!
ship.position = SCNVector3(0, 0, -5)
self.sceneView.scene = myScene
When I call the same code on my orcIdle file, it places the orc exactly at (0,0,0)
self.myScene = SCNScene(named: "art.scnassets/orcIdle.scn")!
// Set the scene to the view
let orc = (myScene.rootNode.childNode(withName: "orcIdle", recursively: false))!
orc.position = SCNVector3(0, 0, -5)
self.sceneView.scene = myScene
here are screenshots of the file node:
This is the default ship file included in the project by Xcode.
This is my orcIdle file.
As you can see, it's the exact same code but 1 moves, and the other doesn't. Also, in the top right corner of the images, i can adjust the Z value there. It works for .ship, but not for .orcIdle.
Is it a scale issue? Any thoughts?
Here's a new screenshot with as much of the scene graph as I can capture.
1 answers
Answer question0
Usually, you must select a skeleton's top hierarchy (like root node) to move geometry, since its mesh was bound to skeleton. If model's skeleton is considerably deeper in the hierarchy use .childNodes[x] subscript syntax to fetch a desired joint.
But a solution based on your .scn file is the following – create a topNode object and put root and LOD_Group inside it.
So your code should look like this:
let scene = SCNScene(named: "art.scnassets/orcIdle.scn")!
orc = scene.rootNode.childNode(withName: "topNode", recursively: true)!
orc.position = SCNVector3(0,0,-20)