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Get dae node size

Suppose I have a collada file that has a box in it, and I import the dae file into the scene. Now, after importing to the scene, I know that the dae object is a field. How can I get window sizes in a script after adding it to the scene

If I import node as SCNBox, I get errors saying that SNCBox is not a subtype of SCNNode.

floorNode = scene.rootNode.childNodeWithName("floor", recursively: false) as SCNBox floorNode?.physicsBody = SCNPhysicsBody.staticBody() floorNode?.physicsBody?.categoryBitMask = 2 let floorGeo: SCNBox = floorNode.geometry! as SCNBox

How to get dimensions if SCNNode is the only way to import nodes?

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2 answers

SCNBox is just a helper subclass of SCNGeometry for creating window geometry. When you import Collada into a scene, you get a SCNNodes scene graph with SCNGeometries, not SCNBox'es or SCNCones, etc. It doesn’t matter what they look like. If you want to get the dimensions of any node, you must use the SCNBoundingVolume protocol, which is implemented by the SCNNode and SCNGeometry classes:

func getBoundingBoxMin (_ min: UnsafeMutablePointer, max max: UnsafeMutablePointer) -> Bool

Using this method, you will get boundary frames. For rectangular geometry, the dimensions will correspond to the bounding box.

Example:

 var v1 = SCNVector3(x:0, y:0, z:0) var v2 = SCNVector3(x:0, y:0, z:0) node.getBoundingBoxMin(&v1, max:&v2)

Where node is node, you want to get a bounding box. Results will be in versions v1 and v2.

Swift 3

Using Swift 3, you can simply use node.boundingBox.min and node.boundingBox.max respectively.

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quick code example on how to use getBoundingBoxMin:

  var min = SCNVector3Zero var max = SCNVector3Zero let b = shipNode.getBoundingBoxMin(&min , max: &max) let w = CGFloat(max.x - min.x) let h = CGFloat(max.y - min.y) let l = CGFloat( max.z - min.z) let boxShape = SCNBox (width: w , height: h , length: l, chamferRadius: 0.0) let shape = SCNPhysicsShape(geometry: boxShape, options: nil) shipNode.physicsBody!.physicsShape = SCNPhysicsShape(geometry: boxShape, options: nil) shipNode.physicsBody = SCNPhysicsBody.dynamicBody()
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