Weapon trail with better alignment of sword rotation

[JaXt0r]

Description

Currently the WeaponTrail is a TrailRenderer from Unity. But this one is a flat Billboard. Let's move it to a custom rendered point-based stretch mesh.

TODOs

• TrailRenderer is not working properly as it's always facing the camera (billboard). Remove it.
• Implement a custom trail renderer which "stretches" the texture and positions it along the way