import pymvr
mvr_file = pymvr.GeneralSceneDescription("mvr_file.mvr")

for layer_index, layer in enumerate(mvr_file.scene.layers):
    ... #process data

import pymvr
from pathlib import Path

# 1. Read MVR file
mvr_read = pymvr.GeneralSceneDescription("mvr_file.mvr")

# 2. Create a writer instance
mvr_writer = pymvr.GeneralSceneDescriptionWriter()

# 3. Serialize the scene object into the writer's XML root
mvr_read.scene.to_xml(parent=mvr_writer.xml_root)

# 4. Serialize the user_data object into the writer's XML root
mvr_read.user_data.to_xml(parent=mvr_writer.xml_root)

# 5. Add necesarry files like GDTF fixtures, trusses, 3D objects and so on
# Skipped in this example

# 6. Write the MVR file
output_path = Path("exported_mvr_file.mvr")
mvr_writer.write_mvr(output_path)

import pymvr
from pathlib import Path

# 1. Create a writer instance
mvr_writer = pymvr.GeneralSceneDescriptionWriter()

# 2. Build the MVR object tree
# Create a scene object
scene_obj = pymvr.Scene()

# Create layers and add them to the scene
layers = pymvr.Layers()
scene_obj.layers = layers

# Create a layer and add it to the layers
layer = pymvr.Layer(name="Test layer")
layers.append(layer)

# Create a child list for the layer
child_list = pymvr.ChildList()
layer.child_list = child_list

# Create a fixture and add it to the child list
# Note: A valid fixture would require more attributes
fixture = pymvr.Fixture(name="Test Fixture")
child_list.fixtures.append(fixture)

# 3. Serialize the scene object into the writer's XML root
scene_obj.to_xml(parent=mvr_writer.xml_root)

# 4. Add any necessary files (like GDTF fixtures, trusses...) to the MVR archive
#    The list should contain tuples of (file_path, GDTF_file_name)
files_to_pack = []
if fixture.gdtf_spec:
    files_to_pack.append((fixture.gdtf_spec, fixture.gdtf_spec))
mvr_writer.files_list = list(set(files_to_pack))

# 5. Write the MVR file
output_path = Path("exported_mvr_file.mvr")
mvr_writer.write_mvr(output_path)