use TubeBufferGeometry can be realised ，but it’s circle
fatLine does not support map
Is there any other way to achieve it?
Now there are only 2-dimensional paths
TubeBufferGeometry is not intended for this kind of geometric shape.
Why not modeling the arrows in Blender, export to glTF and then import via GLTFLoader? In this way, you have full control over the geometry data.
Maybe this post and its whole topic will be helpful: Create a curved plane surface which dynamically changes its size