Import-Export Skinned Graphs

Import/Export Graphs with Skin Modifier for Blender

Instructions

• Download the script and install as an addon.

• Create or open a .blend file containing a graph with the Skin modifier added, but not applied, to the top of the modifier stack. Apply any Mirror or Weld modifiers added.

• Select the mesh and export as a .npz file.

• The .npz file can now be imported. The imported mesh has two levels of Subdivision Surface applied.

File format

The .npz file contains the following arrays:

• verts, 3-tuples of floats, the coordinates of the vertices.
• edges, 2-tuples of integers, the edges.
• skin_radii, 2-tuples of floats, the radii along the x and y axes for each vertex.
• skin_loose, Booleans specifiying whether or not the vertex is marked as loose. This only affects "branch vertices", those with three or more connected edges.
• skin_root, Booleans specifying whether or not the vertex is marked as root. Only one vertex per set of connected vertices will be treated as the root.