How to place one 3D object above the other using ARKit - Scenekit of iOS 11?

Question

I am working on a AR based POC using the sample given by apple https://developer.apple.com/sample-code/wwdc/2017/PlacingObjects.zip.

Is there a way to place a 3D object above another 3D object in Scenekit?

For example i have placed a table above which i have to place something else like a flower vase. How to achieve this?

Because as far as i know, ARKit is detecting only floor surface and if i try to place the flower vase over the already kept table, it is placing it under the table overlapping the existing 3D object. Is this doable?

ARKit

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Posted by

Yaali

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Answer 1

To see the vase as it is placed on the table you should set its position by the right value.

One of the simplest way is to add the vase as a table's child node since you don't need to update vase position whenever the table moves:

tableNode.addChildNode(vaseNode)

Set position of the vase to the middle of the table face. You have to calculate y or set it manually:

vaseNode.position = SCNVector3(0, y, 0)

The following code is to calculate y:

let tableHeight = tableNode.boundingBox.max.y - tableNode.boundingBox.min.y

let vaseHeight = vaseNode.boundingBox.max.y - vaseNode.boundingBox.min.y

Now you can set the vase as it is on the table face:

vaseNode.position = SCNVector3(0, (tableHeight + vaseHeight) / 2, 0)

Posted by

TonyPham

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Answer 2

To see the vase as it is placed on the table you should set its position by the right value.

One of the simplest way is to add the vase as a table's child node since you don't need to update vase position whenever the table moves:

tableNode.addChildNode(vaseNode)

Set position of the vase to the middle of the table face. You have to calculate y or set it manually:

vaseNode.position = SCNVector3(0, y, 0)

The following code is to calculate y:

let tableHeight = tableNode.boundingBox.max.y - tableNode.boundingBox.min.y

let vaseHeight = vaseNode.boundingBox.max.y - vaseNode.boundingBox.min.y

Now you can set the vase as it is on the table face:

vaseNode.position = SCNVector3(0, (tableHeight + vaseHeight) / 2, 0)

Posted by

TonyPham

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How to place one 3D object above the other using ARKit - Scenekit of iOS 11?

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