you dont need any of the complexity there, you can select with plain old unrealbloom without extra passes, copy shader and all that: Struggling with gltf and lighting - #9 by drcmda
just set bloom threshold to 1, any color on any material that’s breaking into hd range will now glow, everything else won’t.
new THREE.Color( 1, 0, 0 ) // red, won’t glow
new THREE.Color( 10, 0, 0 ) // red, will glow