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"""
Dependency graph: Simple exporter
+++++++++++++++++++++++++++++++++
This example is a combination of all previous ones, and shows how to write a simple exporter
script.
"""
import bpy
class OBJECT_OT_simple_exporter(bpy.types.Operator):
"""Simple (fake) exporter of selected objects"""
bl_label = "DEG Export Selected"
bl_idname = "object.simple_exporter"
apply_modifiers: bpy.props.BoolProperty(name="Apply Modifiers")
def execute(self, context):
depsgraph = context.evaluated_depsgraph_get()
for object_instance in depsgraph.object_instances:
if not self.is_object_instance_from_selected(object_instance):
# We only export selected objects
continue
# NOTE: This will create a mesh for every instance, which is not ideal at all. In
# reality destination format will support some sort of instancing mechanism, so the
# code here will simply say "instance this object at object_instance.matrix_world".
mesh = self.create_mesh_for_object_instance(object_instance)
if mesh is None:
# Happens for non-geometry objects.
continue
print(f"Exporting mesh with {len(mesh.vertices)} vertices "
f"at {object_instance.matrix_world}")
object_instace.to_mesh_clear()
return {'FINISHED'}
def is_object_instance_from_selected(self, object_instance):
# For instanced objects we check selection of their instancer (more accurately: check
# selection status of the original object corresponding to the instancer).
if object_instance.parent:
return object_instance.parent.original.select_get()
# For non-instanced objects we check selection state of the original object.
return object_instance.object.original.select_get()
def create_mesh_for_object_instance(self, object_instance):
if self.apply_modifiers:
return object_instance.object.to_mesh()
else:
return object_instance.object.original.to_mesh()
def register():
bpy.utils.register_class(OBJECT_OT_simple_exporter)
def unregister():
bpy.utils.unregister_class(OBJECT_OT_simple_exporter)
if __name__ == "__main__":
register()
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