I am facing a problem with geometry flipping, I tried flipping using the negative scale technique but it fails.
What is the technique that I can use to flip a 3d object across specific axis?
By flipping I mean the object should look as it was rendered over a mirror.
if this is not possible through three.js rendering how can I use Blender to achieve this?
You have to apply a transformation matrix to the geometry (or mesh/object), here is an example for plannar (O, y, z) symetry, you can adapt for your specific case