Rapidform XOR has a pretty cool command called Split Face. It can be used for several different purposes, and one of them is to generate parting lines after you’ve created a CAD model from scan data.

Using Split Face to create parting lines

1) Go to Insert>Modeling Feature>Split Face in XOR

2) Select the Silhouette radio button

3) Define the pull direction (this is the direction the mold will be pulled when separating).  In the example below, we’re going to use the axis of one of the cylinder features of this part, but you can use other reference geometries or features.

4) Pick the target entities that you want to split apart.  Since this is the split faces command, you’ll need to pick one or more faces here.

5) Click the check mark to run the command, and you’re done.