ARCore 1.7 Instantiate Once Code

Hello everyone,

This is my first post and i am a complete noob. I've had some success doing simple things with Unity for VR and AR with Vuforia, just by following tutorials for the time being.

Lately i am trying to use ARCore and i'm facing a simple problem i think for those who know and I thought to ask for help.

I need to instantiate once the object and then use the ObjectManipulation scripts. So far, I didn't find any code for instantiating once, that corresponds to ARCore 1.7, only for v.1.2.

If you could let me know what this code should be and where to place it I would greatly appreciate it!!!

Thank you all in advance!

Alex.