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Fragments.py
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Fragments.py
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"""
Copyright (C) 2024 chuongmep.com
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
from .PackFileReader import PackFileReader
from .Derivative import Derivative
from .ManifestItem import ManifestItem
class Fragments:
def __init__(self):
self.visible = False
self.materialID = 0
self.geometryID = 0
self.dbID = 0
self.transform = None
self.bbox = [0, 0, 0, 0, 0, 0]
@staticmethod
def parse_fragments_from_urn(urn, token, region="US") -> dict:
"""
Parse fragments from urn
:param urn: the urn of the model
:param token: the token authentication
:param region: the region of hub (default is US)
:return: a dictionary of fragments with key is the guid of the manifest item and value is the list of fragments
"""
fragments = {}
derivative = Derivative(urn, token, region)
manifest_items = derivative.read_svf_manifest_items()
for manifest_item in manifest_items:
resources = derivative.read_svf_resource_item(manifest_item)
for resource in resources:
if resource.local_path.endswith("FragmentList.pack"):
bytes_io = derivative.download_stream_resource(resource)
buffer = bytes_io.read()
frags = Fragments.parse_fragments(buffer)
fragments[manifest_item.guid] = frags
return fragments
@staticmethod
def parse_fragments_from_file(file_path) -> list:
"""
Parse fragments from file
:param file_path: FragmentList.pack
:return: a list of fragments
"""
with open(file_path, "rb") as f:
buffer = f.read()
return Fragments.parse_fragments(buffer)
@staticmethod
def parse_fragments(buffer: bytes) -> list:
"""
Parse fragments from buffer
:param buffer: the buffer of the fragment list
:return: a list of fragments
"""
fragments = []
pfr = PackFileReader(buffer)
for i in range(pfr.num_entries()):
entry_type = pfr.seek_entry(i)
assert entry_type is not None
assert entry_type.version > 4
flags = pfr.get_uint8()
visible = (flags & 0x01) != 0
material_id = pfr.get_varint()
geometry_id = pfr.get_varint()
transform = pfr.get_transform()
bbox = [0, 0, 0, 0, 0, 0]
bbox_offset = [0, 0, 0]
if entry_type.version > 3:
if transform is not None and transform.t is not None:
bbox_offset[0] = transform.t[0]
bbox_offset[1] = transform.t[1]
bbox_offset[2] = transform.t[2]
for j in range(6):
bbox[j] = pfr.get_float32() + bbox_offset[j % 3]
db_id = pfr.get_varint()
fragment = Fragments()
fragment.visible = visible
fragment.materialID = material_id
fragment.geometryID = geometry_id
fragment.dbID = db_id
fragment.transform = transform
fragment.bbox = bbox
fragments.append(fragment)
return fragments