Order instances for processing

openpype/hosts/nuke/api/pipeline.py

@@ -2,7 +2,7 @@ import nuke
 
 import os
 import importlib
-from collections import OrderedDict
+from collections import OrderedDict, defaultdict
 
 import pyblish.api
 
@@ -537,7 +537,8 @@ def list_instances(creator_id=None):
     Returns:
         (list) of dictionaries matching instances format
     """
-    listed_instances = []
+    instances_by_order = defaultdict(list)
+    subset_instances = []
     for node in nuke.allNodes(recurseGroups=True):
 
         if node.Class() in ["Viewer", "Dot"]:
@@ -563,9 +564,29 @@ def list_instances(creator_id=None):
         if creator_id and instance_data["creator_identifier"] != creator_id:
             continue
 
-        listed_instances.append((node, instance_data))
+        if "render_order" not in node.knobs():
+            subset_instances.append((node, instance_data))
+            continue
 
-    return listed_instances
+        order = int(node["render_order"].value())
+        instances_by_order[order].append((node, instance_data))
+
+    # Sort instances based on order attribute or subset name.
+    ordered_instances = []
+    for key in sorted(instances_by_order.keys()):
+        instances_by_subset = {}
+        for node, data in instances_by_order[key]:
+            instances_by_subset[data["subset"]] = (node, data)
+        for subkey in sorted(instances_by_subset.keys()):
+            ordered_instances.append(instances_by_subset[subkey])
+
+    instances_by_subset = {}
+    for node, data in subset_instances:
+        instances_by_subset[data["subset"]] = (node, data)
+    for key in sorted(instances_by_subset.keys()):
+        ordered_instances.append(instances_by_subset[key])
+
+    return ordered_instances
 
 
 def remove_instance(instance):

openpype/hosts/nuke/plugins/create/create_write_prerender.py

@@ -30,6 +30,9 @@ class CreateWritePrerender(napi.NukeWriteCreator):
     temp_rendering_path_template = (
         "{work}/renders/nuke/{subset}/{subset}.{frame}.{ext}")
 
+    # Before write node render.
+    order = 90
+
     def get_pre_create_attr_defs(self):
         attr_defs = [
             BoolDef(
@@ -46,6 +49,8 @@ class CreateWritePrerender(napi.NukeWriteCreator):
         if "use_range_limit" in self.instance_attributes:
             linked_knobs_ = ["channels", "___", "first", "last", "use_limit"]
 
+        linked_knobs_.append("render_order")
+
         # add fpath_template
         write_data = {
             "creator": self.__class__.__name__,

openpype/hosts/nuke/plugins/create/create_write_render.py

@@ -39,6 +39,10 @@ class CreateWriteRender(napi.NukeWriteCreator):
         return attr_defs
 
     def create_instance_node(self, subset_name, instance_data):
+        linked_knobs_ = [
+            "channels", "___", "first", "last", "use_limit", "render_order"
+        ]
+
         # add fpath_template
         write_data = {
             "creator": self.__class__.__name__,
@@ -61,6 +65,7 @@ class CreateWriteRender(napi.NukeWriteCreator):
             write_data,
             input=self.selected_node,
             prenodes=self.prenodes,
+            linked_knobs=linked_knobs_,
             **{
                 "width": width,
                 "height": height

openpype/pipeline/create/context.py

@@ -2121,7 +2121,7 @@ class CreateContext:
 
     def reset_instances(self):
         """Reload instances"""
-        self._instances_by_id = {}
+        self._instances_by_id = collections.OrderedDict()
 
         # Collect instances
         error_message = "Collection of instances for creator {} failed. {}"