add simple loading options feature in placeholder

openpype/hosts/maya/api/lib_template_builder.py

@@ -48,6 +48,17 @@ def create_placeholder():
 Defines what openpype loader will be used to load assets.
 Useable loader depends on current host's loader list.
 Field is case sensitive.
+"""),
+ qargparse.String(
+ "loader_args",
+ default="",
+ label="Loader Arguments",
+ placeholder='ex: {"camera":"persp", "lights":True}',
+ help="""Loader
+
+Defines a dictionnary of arguments used to load assets.
+Useable arguments depend on current placeholder Loader.
+Field should be a valid python dict. Anything else will be ignored.
 """),
  qargparse.Integer(
  "order",

openpype/lib/abstract_template_loader.py

@@ -29,6 +29,24 @@ def update_representations(entities, entity):
 
  return entities
 
+def parse_loader_args(loader_args):
+ if not loader_args:
+ return dict()
+ try:
+ parsed_args= eval(loader_args)
+ if not isinstance(parsed_args, dict):
+ return dict()
+ else:
+ return parsed_args
+ except Exception as err:
+ print(
+ "Error while parsing loader arguments '{}'.\n{}: {}\n\n"
+ "Continuing with default arguments. . .".format(
+ loader_args,
+ err.__class__.__name__,
+ err))
+ return dict()
+
 @six.add_metaclass(ABCMeta)
 class AbstractTemplateLoader:
  """
@@ -181,7 +199,8 @@ def populate_template(self, override=None):
  continue
  container = avalon.api.load(
  loaders_by_name[placeholder.loader],
- last_representation['_id'])
+ last_representation['_id'],
+ options=parse_loader_args(placeholder.data['loader_args']))
  placeholder.parent_in_hierarchy(container)
  placeholder.clean()
  # Merge to populate_template
@@ -222,7 +241,8 @@ def update_template(self):
  continue
  container = avalon.api.load(
  loaders_by_name[placeholder.loader],
- last_representation['_id'])
+ last_representation['_id'],
+ options=parse_loader_args(placeholder.data['loader_args']))
  placeholder.parent_in_hierarchy(container)
  placeholder.clean()
 
@@ -292,8 +312,8 @@ class AbstractPlaceholder:
 
  """
 
- attributes = {'builder_type', 'family',
- 'representation', 'order', 'loader'}
+ attributes = {'builder_type', 'family', 'representation',
+ 'order', 'loader', 'loader_args'}
  optional_attributes = {}
 
  def __init__(self, node):