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# Copyright (c) 2019 Ultimaker B.V., fieldOfView
# Cura is released under the terms of the LGPLv3 or higher.
# The _toMeshData function is taken from the AMFReader class which was built by fieldOfView.
from typing import Any, List, Union, TYPE_CHECKING
import numpy # To create the mesh data.
import os.path # To create the mesh name for the resulting mesh.
import trimesh # To load the files into a Trimesh.
from UM.Mesh.MeshData import MeshData, calculateNormalsFromIndexedVertices # To construct meshes from the Trimesh data.
from UM.Mesh.MeshReader import MeshReader # The plug-in type we're extending.
from UM.MimeTypeDatabase import MimeTypeDatabase, MimeType # To add file types that we can open.
from UM.Scene.GroupDecorator import GroupDecorator # Added to the parent node if we load multiple nodes at once.
from cura.CuraApplication import CuraApplication
from cura.Scene.BuildPlateDecorator import BuildPlateDecorator # Added to the resulting scene node.
from cura.Scene.ConvexHullDecorator import ConvexHullDecorator # Added to group nodes if we load multiple nodes at once.
from cura.Scene.CuraSceneNode import CuraSceneNode # To create a node in the scene after reading the file.
from cura.Scene.SliceableObjectDecorator import SliceableObjectDecorator # Added to the resulting scene node.
if TYPE_CHECKING:
from UM.Scene.SceneNode import SceneNode
class TrimeshReader(MeshReader):
"""Class that leverages Trimesh to import files."""
def __init__(self) -> None:
super().__init__()
self._supported_extensions = [".ctm", ".dae", ".gltf", ".glb", ".ply", ".zae"]
MimeTypeDatabase.addMimeType(
MimeType(
name = "application/x-ctm",
comment = "Open Compressed Triangle Mesh",
suffixes = ["ctm"]
)
)
MimeTypeDatabase.addMimeType(
MimeType(
name = "model/vnd.collada+xml",
comment = "COLLADA Digital Asset Exchange",
suffixes = ["dae"]
)
)
MimeTypeDatabase.addMimeType(
MimeType(
name = "model/gltf-binary",
comment = "glTF Binary",
suffixes = ["glb"]
)
)
MimeTypeDatabase.addMimeType(
MimeType(
name = "model/gltf+json",
comment = "glTF Embedded JSON",
suffixes = ["gltf"]
)
)
# Trimesh seems to have a bug when reading .off files.
#MimeTypeDatabase.addMimeType(
# MimeType(
# name = "application/x-off",
# comment = "Geomview Object File Format",
# suffixes = ["off"]
# )
#)
MimeTypeDatabase.addMimeType(
MimeType(
name = "application/x-ply", # Wikipedia lists the MIME type as "text/plain" but that won't do as it's not unique to PLY files.
comment = "Stanford Triangle Format",
suffixes = ["ply"]
)
)
MimeTypeDatabase.addMimeType(
MimeType(
name = "model/vnd.collada+xml+zip",
comment = "Compressed COLLADA Digital Asset Exchange",
suffixes = ["zae"]
)
)
def _read(self, file_name: str) -> Union["SceneNode", List["SceneNode"]]:
"""Reads a file using Trimesh.
:param file_name: The file path. This is assumed to be one of the file
types that Trimesh can read. It will not be checked again.
:return: A scene node that contains the file's contents.
"""
# CURA-6739
# GLTF files are essentially JSON files. If you directly give a file name to trimesh.load(), it will
# try to figure out the format, but for GLTF, it loads it as a binary file with flags "rb", and the json.load()
# doesn't like it. For some reason, this seems to happen with 3.5.7, but not 3.7.1. Below is a workaround to
# pass a file object that has been opened with "r" instead "rb" to load a GLTF file.
if file_name.lower().endswith(".gltf"):
mesh_or_scene = trimesh.load(open(file_name, "r", encoding = "utf-8"), file_type = "gltf")
else:
mesh_or_scene = trimesh.load(file_name)
meshes = [] # type: List[Union[trimesh.Trimesh, trimesh.Scene, Any]]
if isinstance(mesh_or_scene, trimesh.Trimesh):
meshes = [mesh_or_scene]
elif isinstance(mesh_or_scene, trimesh.Scene):
meshes = [mesh for mesh in mesh_or_scene.geometry.values()]
active_build_plate = CuraApplication.getInstance().getMultiBuildPlateModel().activeBuildPlate
nodes = [] # type: List[SceneNode]
for mesh in meshes:
if not isinstance(mesh, trimesh.Trimesh): # Trimesh can also receive point clouds, 2D paths, 3D paths or metadata. Skip those.
continue
mesh.merge_vertices()
mesh.remove_unreferenced_vertices()
mesh.fix_normals()
mesh_data = self._toMeshData(mesh, file_name)
file_base_name = os.path.basename(file_name)
new_node = CuraSceneNode()
new_node.setMeshData(mesh_data)
new_node.setSelectable(True)
new_node.setName(file_base_name if len(meshes) == 1 else "{file_base_name} {counter}".format(file_base_name = file_base_name, counter = str(len(nodes) + 1)))
new_node.addDecorator(BuildPlateDecorator(active_build_plate))
new_node.addDecorator(SliceableObjectDecorator())
nodes.append(new_node)
if len(nodes) == 1:
return nodes[0]
# Add all nodes to a group so they stay together.
group_node = CuraSceneNode()
group_node.addDecorator(GroupDecorator())
group_node.addDecorator(ConvexHullDecorator())
group_node.addDecorator(BuildPlateDecorator(active_build_plate))
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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