Add AMF reader plugin

plugins/AMFReader/AMFReader.py

@@ -0,0 +1,164 @@
+# Copyright (c) 2019 fieldOfView
+# The Cura is released under the terms of the LGPLv3 or higher.
+
+# This AMF parser is based on the AMF parser in legacy cura:
+# https://github.com/daid/LegacyCura/blob/ad7641e059048c7dcb25da1f47c0a7e95e7f4f7c/Cura/util/meshLoaders/amf.py
+
+from cura.CuraApplication import CuraApplication
+from UM.Logger import Logger
+
+from UM.Mesh.MeshData import MeshData, calculateNormalsFromIndexedVertices
+from UM.Mesh.MeshReader import MeshReader
+
+from cura.Scene.CuraSceneNode import CuraSceneNode
+from cura.Scene.SliceableObjectDecorator import SliceableObjectDecorator
+from cura.Scene.BuildPlateDecorator import BuildPlateDecorator
+from cura.Scene.ConvexHullDecorator import ConvexHullDecorator
+from UM.Scene.GroupDecorator import GroupDecorator
+
+import numpy
+import trimesh
+import os.path
+import zipfile
+
+MYPY = False
+try:
+    if not MYPY:
+        import xml.etree.cElementTree as ET
+except ImportError:
+    import xml.etree.ElementTree as ET
+
+from typing import Dict
+
+class AMFReader(MeshReader):
+    def __init__(self) -> None:
+        super().__init__()
+        self._supported_extensions = [".amf"]
+        self._namespaces = {}   # type: Dict[str, str]
+
+    # Main entry point
+    # Reads the file, returns a SceneNode (possibly with nested ones), or None
+    def _read(self, file_name):
+        base_name = os.path.basename(file_name)
+        try:
+            zipped_file = zipfile.ZipFile(file_name)
+            xml_document = zfile.read(zipped_file.namelist()[0])
+            zipped_file.close()
+        except zipfile.BadZipfile:
+            raw_file = open(file_name, "r")
+            xml_document = raw_file.read()
+            raw_file.close()
+
+        try:
+            amf_document = ET.fromstring(xml_document)
+        except ET.ParseError:
+            Logger.log("e", "Could not parse XML in file %s" % base_name)
+            return None
+
+        if "unit" in amf_document.attrib:
+            unit = amf_document.attrib["unit"].lower()
+        else:
+            unit = "millimeter"
+        if unit == "millimeter":
+            scale = 1.0
+        elif unit == "meter":
+            scale = 1000.0
+        elif unit == "inch":
+            scale = 25.4
+        elif unit == "feet":
+            scale = 304.8
+        elif unit == "micron":
+            scale = 0.001
+        else:
+            Logger.log("w", "Unknown unit in amf: %s. Using mm instead." % unit)
+            scale = 1.0
+
+        nodes = []
+        for amf_object in amf_document.iter("object"):
+            for amf_mesh in amf_object.iter("mesh"):
+                amf_mesh_vertices = []
+                for vertices in amf_mesh.iter("vertices"):
+                    for vertex in vertices.iter("vertex"):
+                        for coordinates in vertex.iter("coordinates"):
+                            v = [0.0,0.0,0.0]
+                            for t in coordinates:
+                                if t.tag == "x":
+                                    v[0] = float(t.text) * scale
+                                elif t.tag == "y":
+                                    v[2] = float(t.text) * scale
+                                elif t.tag == "z":
+                                    v[1] = float(t.text) * scale
+                            amf_mesh_vertices.append(v)
+                if not amf_mesh_vertices:
+                    continue
+
+                indices = []
+                for volume in amf_mesh.iter("volume"):
+                    for triangle in volume.iter("triangle"):
+                        f = [0,0,0]
+                        for t in triangle:
+                            if t.tag == "v1":
+                                f[0] = int(t.text)
+                            elif t.tag == "v2":
+                                f[1] = int(t.text)
+                            elif t.tag == "v3":
+                                f[2] = int(t.text)
+                        indices.append(f)
+
+                    mesh = trimesh.base.Trimesh(vertices=numpy.array(amf_mesh_vertices, dtype=numpy.float32), faces=numpy.array(indices, dtype=numpy.int32))
+                    mesh.merge_vertices()
+                    mesh.remove_unreferenced_vertices()
+                    mesh.fix_normals()
+                    mesh_data = self._toMeshData(mesh)
+
+                    new_node = CuraSceneNode()
+                    new_node.setSelectable(True)
+                    new_node.setMeshData(mesh_data)
+                    new_node.setName(base_name if len(nodes)==0 else "%s %d" % (base_name, len(nodes)))
+                    new_node.addDecorator(BuildPlateDecorator(CuraApplication.getInstance().getMultiBuildPlateModel().activeBuildPlate))
+                    new_node.addDecorator(SliceableObjectDecorator())
+
+                    nodes.append(new_node)
+
+        if not nodes:
+            Logger.log("e", "No meshes in file %s" % base_name)
+            return None
+
+        if len(nodes) == 1:
+            return nodes[0]
+
+        # Add all scenenodes to a group so they stay together
+        group_node = CuraSceneNode()
+        group_node.addDecorator(GroupDecorator())
+        group_node.addDecorator(ConvexHullDecorator())
+        group_node.addDecorator(BuildPlateDecorator(CuraApplication.getInstance().getMultiBuildPlateModel().activeBuildPlate))
+
+        for node in nodes:
+            node.setParent(group_node)
+
+        return group_node
+
+    def _toMeshData(self, tri_node: trimesh.base.Trimesh) -> MeshData:
+        tri_faces = tri_node.faces
+        tri_vertices = tri_node.vertices
+
+        indices = []
+        vertices = []
+
+        index_count = 0
+        face_count = 0
+        for tri_face in tri_faces:
+            face = []
+            for tri_index in tri_face:
+                vertices.append(tri_vertices[tri_index])
+                face.append(index_count)
+                index_count += 1
+            indices.append(face)
+            face_count += 1
+
+        vertices = numpy.asarray(vertices, dtype=numpy.float32)
+        indices = numpy.asarray(indices, dtype=numpy.int32)
+        normals = calculateNormalsFromIndexedVertices(vertices, indices, face_count)
+
+        mesh_data = MeshData(vertices=vertices, indices=indices, normals=normals)
+        return mesh_data

plugins/AMFReader/__init__.py

@@ -0,0 +1,10 @@
+# Copyright (c) 2019 fieldOfView
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from . import AMFReader
+
+def getMetaData():
+    return {}
+
+def register(app):
+    return {"mesh_reader": AMFReader.AMFReader()}

plugins/AMFReader/plugin.json

@@ -0,0 +1,8 @@
+{
+    "name": "AMF Reader",
+    "author": "fieldOfView",
+    "version": "3.5.0",
+    "description": "Provides support for reading AMF files.",
+    "api": 5,
+    "supported_sdk_versions": ["5.0.0", "6.0.0"]
+}