CODEWITHSUNDEEP
scenekit
Siddharth Shekar
Siddharth Shekar

Reputation: 448

Get size of dae node

Suppose I have a collada file which has a box in it and I import the dae file into the scene. Now after importing in the scene I know the dae object is a box. How can I get the dimensions of the box in scenekit after adding it to the scene

If I import the node as a 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 do I get the dimensions if SCNNode is the only way to import nodes?

Upvotes: 10

Views: 8292

Answers (3)

Darkwonder
Darkwonder

Reputation: 1305

Swift 5.4.

import ARKit

extension SCNNode {
    
    var height: CGFloat { CGFloat(self.boundingBox.max.y - self.boundingBox.min.y) }
    var width: CGFloat { CGFloat(self.boundingBox.max.x - self.boundingBox.min.x) }
    var length: CGFloat { CGFloat(self.boundingBox.max.z - self.boundingBox.min.z) }
    
    var halfCGHeight: CGFloat { height / 2.0 }
    var halfHeight: Float { Float(height / 2.0) }
    var halfScaledHeight: Float { halfHeight * self.scale.y  }
}

// Usage:
let node = SCNNode()
node.height
node.width
node.lenght

Upvotes: 0

Apps
Apps

Reputation: 126

Example Swift code on how to use boundingBox:

var min = shipNode.boundingBox.min
var max = shipNode.boundingBox.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.dynamic()

Upvotes: 10

Ef Dot
Ef Dot

Reputation: 768

SCNBox is just helper subclass of SCNGeometry for box geometry creation. When you import Collada into a scene, you get scene graph of SCNNodes with SCNGeometries, not SCNBox'es or SCNCones etc doesn't matter how they look. If you want to get dimensions of any node you should use SCNBoundingVolume protocol, which is implemented by both SCNNode and SCNGeometry classes:

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

With this method you will get bounding box corners. For box-shaped geometry, dimensions will match 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 bounding box of. Results will be in v1 and v2.

Swift 3

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

Upvotes: 11

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