Unknown Squid
1551882687
Here's a basic run down on what you need to do.Separate knives into it's own mesh in blender (if not already separate from the body), duplicate (ctrl-D) a knife and parent to a hand, recentre duplicated knife to 0,0,0 and then adjust position to how it would be held against palm, disable the duplicate so that it's not visible by default. Create a duplicate of the avatar and use that one to create an animation that re-enables the held knife whilst disabling the holstered knife, copy in finger properties from a default gesture pack and adjust fingers to correct gripping appearance. Add a subtle knife drawing sound for extra effect if desired.
If you get stuck on any steps, you now know roughly what to ask or google for help on. Good luck.
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