Prop Setup
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The example prop used in this article is prop_container_05a.yft
You'll also notice that each Drawable Model is rigged using a Child Of constraint instead of vertex groups.
This is the case for all props. Typically each Drawable Model for a prop corresponds to a particular separable part of the Fragment. Notice there is a Drawable Model for the latch, each door, and the container itself.
This matches up with the bone hierarchy.
Each bone is parented to Prop_Container_05a and is thus affected by that bone. Every skeleton in the game engine always has one root bone that all the other bones are parented to.
If you attempt to add multiple top-level bones (bones with no parent) you will run into issues. Make sure there is a single "root" bone that all other bones are parented to!
Notice, too, that each bone has Use Physics enabled. This means that each of those parts will have physics in-game and will separate from each other.
As mentioned before, each bone with physics enabled must have an associated collision. However, there can be multiple collisions for a single bone. Notice for this prop, there is a single collision for the latch and the doors, but the container itself is comprised of 5 box collisions.
Each of these collision objects is linked to a bone via a Child Of Constraint.
Each collision also has its mass set in the Object Properties > Sollumz > Physics panel.
