Added initial files.

src/builder.py

@@ -0,0 +1,65 @@
+import bpy
+import bmesh
+from .psk import Psk, Vector3
+
+
+class PskBuilder(object):
+    def __init__(self):
+        pass
+
+    def build(self, context) -> Psk:
+        object = context.view_layer.objects.active
+        if object.type != 'MESH':
+            raise RuntimeError('Selected object must be a Mesh')
+
+        # ensure that there is exactly one armature modifier
+        modifiers = [x for x in object.modifiers if x.type == 'ARMATURE']
+        if len(modifiers) != 1:
+            raise RuntimeError('the mesh must have one armature modifier')
+        armature_modifier = modifiers[0]
+        armature_object = armature_modifier.object
+
+        if armature_object is None:
+            raise RuntimeError('the armature modifier has no linked object')
+
+        # TODO: probably requires at least one bone? not sure
+        mesh_data = object.data
+
+        # TODO: if there is an edge-split modifier, we need to apply it.
+
+        # TODO: duplicate all the data
+        mesh = bpy.data.meshes.new('export')
+
+        # copy the contents of the mesh
+        bm = bmesh.new()
+        bm.from_mesh(mesh_data)
+        # triangulate everything
+        bmesh.ops.triangulate(bm, faces=bm.faces)
+        bm.to_mesh(mesh)
+        bm.free()
+        del bm
+
+        psk = Psk()
+
+        # vertices
+        for vertex in mesh.vertices:
+            psk.points.append(Vector3(*vertex.co))
+
+        # TODO: wedges (a "wedge" is actually a UV'd vertex, basically)
+        # for wedge in mesh.wedges:
+        #     pass
+
+        # materials
+        for i, m in enumerate(object.data.materials):
+            material = Psk.Material()
+            material.name = m.name
+            material.texture_index = i
+            psk.materials.append(material)
+
+        # TODO: should we make the wedges/faces at the same time??
+        f = Psk.Face()
+        # f.wedge_index_1 = 0
+
+        # TODO: weights
+
+        return psk