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In FEM, how could I get rid of edginess shapes...? Aug. 7, 2018, 9:56 a.m.

There are several ways to control and influence the look of your fractured surfaces with FEM.

Using an embedded tet mesh can help. You can manipulate the embedded tet mesh to get a look that you want for your fractured surfaces without impacting the sim very much.

The best option for directly controlling the shape of the fractured surfaces is to use the fracturepart primitive attribute. This allows you to create little chunks (fracture parts) that won't get separated no matter what happens. The fracturing remains dynamic, however it is restricted such that it does not fracture between tets that have the same fracturepart value. The Solid Fracture SOP creates such a fracturepart attribute for you, but you can create the attribute yourself if you like. If you use fracturepart to create fairly round parts then you'll avoid the edgy shapes that you're seeing.

You can take a look at what the Fractured Solid Object shelf tool does with regards to the embedded setup and the creation of a fracturepart attribute.

Fracturecount attribute in FEM simulation not visible Jan. 9, 2018, 1:23 p.m.

The docs on this feature appear to be a bit out of date: The ‘fracturecount’ attribute is generated only when “Create Fracture Attributes” is enabled on the Solid Object.

I hope this helps.

A way to create static FEM? Dec. 1, 2017, 9:31 a.m.

I'm assuming that you want to have the face stay in mostly in the same place where it starts, but that you still want the face to react to external collisions.

The easiest way to do this is to enable “Target Deformation” under the Deformation Tab of the Solid Object.
By default, this will create a soft constraint that keeps the face in its original position.
You will have to find the right value for Target Strength for this to happen.
The higher you pick this value, the more the face will stay where it was.

Another option is to use the “Constrain Points To Target” shelf tool to make sure that parts of the face stay in place, while other parts can freely simulate and response to external collisions.