The RBD Glued Objects tool is useful for shattering pre-fractured geometry. It creates multiple rigid bodies in the DOP simulation in the same manner as the RBD Objects tool, but also creates a constraint network to glue together nearby pieces.

Glue is very different than the other constraint types that the Bullet solver supports. Objects that are glued together are simulated together as a single object, as opposed to something like a pin constraint where the objects are simulated separately but a constraint tries to keep the anchor points at the same position/orientation. This means that the positions of the anchor points don’t actually matter for glue, aside from visualization purposes.

The current position of an anchor point is computed based on the initial position and the object’s (rigid) transform. Deformation is not taken into account since anchor points are not, for example, attached to a particular point number in the object’s geometry. You may want to update the constraint network’s point positions on each frame for objects that are inactive and deforming. For glue though, that only affects visualization.

1. Select the geometry to convert to RBD objects.

2. If necessary, define the pieces to be fractured. For example, using the Shatter tool.

3. Select the object and click the RBD Glued Objects tool on the Rigid Bodies tab.

1. Click the Dynamics Select Mode button on the selector and handle controls toolbar.

2. Click the RBD glue object in the scene view.