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179 | class ExtractUSD(plugin.BlenderExtractor,
OptionalPyblishPluginMixin):
"""Extract as USD."""
label = "Extract USD"
hosts = ["blender"]
families = ["usd"]
convert_orientation = False
def process(self, instance):
if not self.is_active(instance.data):
return
# Ignore runtime instances (e.g. USD layers)
# TODO: This is better done via more specific `families`
if not instance.data.get("transientData", {}).get("instance_node"):
return
# Define extract output file path
stagingdir = self.staging_dir(instance)
filename = f"{instance.name}.usd"
filepath = os.path.join(stagingdir, filename)
# Perform extraction
self.log.debug("Performing extraction..")
# Select all members to "export selected"
plugin.deselect_all()
selected = []
for obj in instance:
if isinstance(obj, bpy.types.Object):
obj.select_set(True)
selected.append(obj)
root = lib.get_highest_root(objects=instance[:])
if not root:
instance_node = instance.data["transientData"]["instance_node"]
raise KnownPublishError(
f"No root object found in instance: {instance_node.name}"
)
self.log.debug(f"Exporting using active root: {root.name}")
context = plugin.create_blender_context(
active=root, selected=selected)
attribute_values = self.get_attr_values_from_data(instance.data)
convert_orientation = attribute_values.get(
"convert_orientation",
self.convert_orientation
)
kwargs = {
"convert_orientation": convert_orientation,
"export_global_forward_selection": attribute_values.get("forward_axis", "Z"),
"export_global_up_selection": attribute_values.get("up_axis", "Y"),
}
if lib.get_blender_version() < (4, 2, 1):
kwargs = {}
if convert_orientation:
self.log.warning(
"Convert orientation was enabled for USD export but is not "
"supported in Blender < \"4.2.1\". Please update to at least Blender "
"4.2.1 to support it."
)
# Export USD
with bpy.context.temp_override(**context):
bpy.ops.wm.usd_export(
# Override the `/root` default value. If left as an empty
# string, Blender will use the top-level object as the root prim.
filepath=filepath,
root_prim_path="",
selected_objects_only=True,
export_textures=False,
relative_paths=False,
export_animation=False,
export_hair=False,
export_uvmaps=True,
# TODO: add for new version of Blender (4+?)
# export_mesh_colors=True,
export_normals=True,
export_materials=True,
use_instancing=True,
# Convert Orientation
**kwargs
)
plugin.deselect_all()
# Add representation
representation = {
'name': 'usd',
'ext': 'usd',
'files': filename,
"stagingDir": stagingdir,
}
instance.data.setdefault("representations", []).append(representation)
self.log.debug("Extracted instance '%s' to: %s",
instance.name, representation)
@classmethod
def get_attr_defs_for_instance(cls, create_context, instance):
# Filtering of instance, if needed, can be customized
if not cls.instance_matches_plugin_families(instance):
return []
# Attributes logic
publish_attributes = cls.get_attr_values_from_data_for_plugin(
cls, instance
)
visible = publish_attributes.get("convert_orientation", cls.convert_orientation)
orientation_axes = {
"X": "X",
"Y": "Y",
"Z": "Z",
"NEGATIVE_X": "-X",
"NEGATIVE_Y": "-Y",
"NEGATIVE_Z": "-Z",
}
return [
BoolDef("convert_orientation",
label="Convert Orientation",
tooltip="Convert orientation axis to a different"
" convention to match other applications.",
default=cls.convert_orientation),
EnumDef("forward_axis",
label="Forward Axis",
items=orientation_axes,
default="Z",
visible=visible),
EnumDef("up_axis",
label="Up Axis",
items=orientation_axes,
default="Y",
visible=visible)
]
@classmethod
def register_create_context_callbacks(cls, create_context):
create_context.add_value_changed_callback(cls.on_values_changed)
@classmethod
def on_values_changed(cls, event):
"""Update instance attribute definitions on attribute changes."""
# Update attributes if any of the following plug-in attributes
# change:
keys = ["convert_orientation"]
for instance_change in event["changes"]:
instance = instance_change["instance"]
if not cls.instance_matches_plugin_families(instance):
continue
value_changes = instance_change["changes"]
plugin_attribute_changes = cls.get_attr_values_from_data_for_plugin(
cls, value_changes
)
if not any(key in plugin_attribute_changes for key in keys):
continue
# Update the attribute definitions
new_attrs = cls.get_attr_defs_for_instance(
event["create_context"], instance
)
instance.set_publish_plugin_attr_defs(cls.__name__, new_attrs)
|