Take a look at the Collection of examples from discourse.threejs.org
for instance
https://hofk.de/main/discourse.threejs/2017/index2017.html
https://hofk.de/main/discourse.threejs/2017/BufferGeometry/BufferGeometry.html
https://hofk.de/main/discourse.threejs/2017/Indexed%20BufferGeometry/Indexed%20BufferGeometry.html
https://hofk.de/main/discourse.threejs/2018/index2018.html
https://hofk.de/main/discourse.threejs/2018/BufferWithNormals/BufferWithNormals.html
https://hofk.de/main/discourse.threejs/2019/index2019.html
https://hofk.de/main/discourse.threejs/2019/ColorStripeChanging/ColorStripeChanging.html
Note!
.addAttribute now is .setAttribute