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# Copyright (c) 2019 fieldOfView, Ultimaker B.V.
# 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 UM.MimeTypeDatabase import MimeTypeDatabase, MimeType
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]
MimeTypeDatabase.addMimeType(
MimeType(
name = "application/x-amf",
comment = "AMF",
suffixes = ["amf"]
)
)
# 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 = zipped_file.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, file_name)
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, file_name: str = "") -> MeshData:
"""Converts a Trimesh to Uranium's MeshData.
:param tri_node: A Trimesh containing the contents of a file that was just read.
:param file_name: The full original filename used to watch for changes
:return: Mesh data from the Trimesh in a way that Uranium can understand it.
"""
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,file_name = file_name)
return mesh_data
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