It looked fine on Spine editor but when I uploaded on the website through three.js, some attatchments are blinking and sometimes disappearing.
how can i fix this?
attachments are disappearing/blinking on three.js
it looks like three.js's 'depthWrite' property.
when i set depthWrite to false it doesn't happen but i need it to set to true.
what should i do?
It's impossible to help just by looking at the video. At a minimum, we'll need the exported Spine files (.skel/.json/.atlas/.png), and ideally a minimal reproduction sample, e.g. a simple .html file that loads and sets up the skeleton by e.g. queuing the animations and setting the skins that have the issue.
Just based on the video, it looks like z-fighting. You can try increasing the SkeletonMesh.zOffset value from 0.1 to something higher. That depends on your scene depth, and what type of depth buffer you are using.