(Source Filmmaker) Item Lock Tutorial
3,048In this tutorial, I show you how to lock items to parts of your character's body so that they move together. You can also use this technique to lock hats to your character's heads and more! Experiment with it and see what you can create.
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BETTER METHOD FOR WEAPONS (Thanks to SADXhacker):
1. Expand the Soldier in the Animation Set Editor, then expand his "Other" category.
2. Expand the Pain Train in the Animation Set Editor, then expand its "Body" category.
3. Drag weapon_bone (Soldier's "Other" category) onto the square/lock box next to rootTransform (Pain Train's "Body" category).
4. Click rootTransform (Pain Train's "Body" category) in the Animation Set Editor so that it is selected.
5. Enter the Motion Editor.
6. Click on the "Zero" Procedural setting and move your mouse to the right until the squiggly lines in the Motion Editor become one straight line.
7. Rotate the Pain Train so that it is upright and facing the right direction.
These steps both lock the Pain Train to your Soldier's hand and position it directly in the middle of his hand. The only work you have left to do is to rotate it, preferably with the Rotate tool for maximum precision. These steps can be performed with any weapon for any character (and even other objects you want him to hold, such as hats, small items, or whatever). The lengthier method shown in this video can still be utilized to lock many other types of objects to one another and even items to your character's head, body, or non-weapon hand.
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Source Filmmaker is available for free from Steam.