split primitive islands into separate primitives

split_geometry_primitives.py

old_primitive =  { 'material': '2.mat', 'verts': [1, 4, 7, 7, 8, 9, 9, 0, 0]}
tris = [old_primitive['verts'][i:i+3] for i in range(0, len(old_primitive['verts']), 3)]

new_primitives = {}
primitive_id = 0
new_element = {'triangles':[]}
for i, tri in enumerate(tris):
    prev = [item for sublist in tris[:i] for item in sublist]
    if any(v in prev for v in tri):
        new_primitives[primitive_id] = new_element
        new_element['triangles'].append(tri)
    else:
        primitive_id +=1
        new_element['triangles'] = [tri]

new_primitives[primitive_id] = new_element

print(new_primitives)