I totally understand that three.js is a client side, but want to confirm if it reachable to have an animation into a video or lets say images using server side?
You can use three.js to render applications on node.js. There are several discussion about this topic like this one:
three.js can’t directly render a video for you but you can do it by yourself by using a library like FFmpeg. That is how the editor does it:
In case, somebody is interested for paid online tool, i will recommend Convert HTML5 animation to Video
In my old pc, recording through chrome extension was not giving 60fps me smooth video. I got new laptop for this purpose and things are now working well.