hydra_storm/engine.py

@@ -7,6 +7,11 @@ from pathlib import Path
 
 import bpy
 import bpy_hydra
+import _bpy_hydra
+
+from pxr import Usd
+
+from .preferences import addon_preferences
 
 
 class StormHydraRenderEngine(bpy_hydra.HydraRenderEngine):
@@ -19,10 +24,22 @@ class StormHydraRenderEngine(bpy_hydra.HydraRenderEngine):
 
     delegate_id = 'HdStormRendererPlugin'
 
+    def __init__(self):
+        self._usd_stage = None
+
+    def _sync_usd_stage(self):
+        preferences = addon_preferences()
+        dev = bpy.context.scene.hydra_storm.dev
+        if preferences.dev_tools and dev.render_usd and dev.usd_file:
+            if not self._usd_stage:
+                self._usd_stage = Usd.Stage.Open(dev.usd_file)
+
+            if self._usd_stage:
+                _bpy_hydra.engine_sync_usd(self.engine_ptr, self._usd_stage)
+
     @classmethod
     def register(cls):
         super().register()
-
         bpy_hydra.register_plugins([str(Path(__file__).parent / "plugin")])
 
     def get_render_settings(self, engine_type):
@@ -35,6 +52,16 @@ class StormHydraRenderEngine(bpy_hydra.HydraRenderEngine):
             'maxLights': settings.max_lights,
         }
 
+    def update(self, data, depsgraph):
+        super().update(data, depsgraph)
+        self._sync_usd_stage()
+
+    def view_update(self, context, depsgraph):
+        super().view_update(context, depsgraph)
+        self._sync_usd_stage()
+
+
+
 
 register, unregister = bpy.utils.register_classes_factory((
     StormHydraRenderEngine,

hydra_storm/preferences.py

@@ -19,9 +19,6 @@ class AddonPreferences(bpy.types.AddonPreferences):
 
 
 def addon_preferences():
-    if 'hydra_storm' not in bpy.context.preferences.addons:
-        return None
-
     return bpy.context.preferences.addons['hydra_storm'].preferences
 
 

hydra_storm/properties.py

@@ -23,18 +23,15 @@ class Properties(bpy.types.PropertyGroup):
 
 
 class DevProperties(bpy.types.PropertyGroup):
-    render_data: bpy.props.EnumProperty(
-        name="Render Data",
-        description="Select data to render",
-        items=(('BLENDER', "Blender", "Render Blender scene"),
-               ('USD', "USD", "Render USD file"),
-               ('ALL', "All", "Render Blender scene and USD file")),
-        default='BLENDER',
+    render_usd: bpy.props.BoolProperty(
+        name="Render USD",
+        description="Render USD file with Blender scene",
+        default=False,
     )
     usd_file: bpy.props.StringProperty(
         name="USD File",
-        description="Select data to render",
-        subtype='DIR_PATH',
+        description="Select USD file to render",
+        subtype='FILE_PATH',
     )
 
 

hydra_storm/ui.py

@@ -103,10 +103,12 @@ class STORM_HYDRA_PT_dev(Panel):
         layout.use_property_split = True
         layout.use_property_decorate = False
 
-        settings = context.scene.hydra_storm.dev
-        layout.prop(settings, 'render_data')
-        if settings.render_data in ('USD', 'ALL'):
-            layout.prop(settings, 'usd_file')
+        dev = context.scene.hydra_storm.dev
+        col = layout.column()
+        col.prop(dev, 'render_usd')
+        row = col.row()
+        row.enabled = dev.render_usd
+        row.prop(dev, 'usd_file')
 
 
 register_classes, unregister_classes = bpy.utils.register_classes_factory((