Is there a ThreeJS to Collada Exporter?
I don’t believe there is one.
If you look into the THREE.js editor export menu, the options available for exports are JSON, OBJ and STL. I am afraid those 3 options are the only export format available. Plz. someone confirm!
https://clara.io might work - you can import three.js json scenes and export as collada.
You’ll have to test it to see how well it works for your scene though.
In the meanwhile, @gkjohnson added one . Here is the respective example: