I was just editing my post and someone (probably you) did something and it all vanished because only one post can be being edited.
So to write it a second time , I repacked a new version of the scene here:
https://bit.ly/3BFPklIIn the shader .fsh file the following can be edited:
// Define the interocular distance (adjust this value as needed)
float interocularDistance = 0.04; // Positive value for demonstration
Increasing the interocularDistance will make the background move further back.
In the scn file this section controls the model and her magical floating disc:
// LHS Scene
node{
node{
node{
node{
pos: -1200, -100, -1000
Pushing this to the left say changing -1200 to -1250 will also push the model further back.
I find them a bit temperamental. I find the depth of the model needs to be not too different to the background to get a good result.