3D Model is not looking same as size in ARKit

Question

Problem statement

I am facing a trouble in AR that our model size does not match with real products.This iPhone has the same dimension as real iPhone but it doesn't match with real products.

IPhone Model Size - (5.44 x 2.64 x 0.28 in)

Reference Screenshot

Reference .obj file Download obj

Answer 1

It's highly likely that the scale of the .obj is not correct.

If you load your model into the SceneKit Editor, and click on the 'cube' on the right hand side:

You will see in the transforms section an area which says Bounding Box.

You can check here to see if your model is actually the right size:

In my example my model is an SCNPlane with a width and height of 0.1m (10cm).

If your bounding box is then not correct, you will need to set the scale which can be done using the scale property of an SCNNode e.g:

model.scale = SCNVector3(0.1, 0.1, 0.1)

Whereby:

Each component of the scale vector multiplies the corresponding dimension of the node’s geometry. The default scale is 1.0 in all three dimensions. For example, applying a scale of (2.0, 0.5, 2.0) to a node containing a cube geometry reduces its height and increases its width and depth.

Hope it helps...