Merge pull request #213 from bakwc/workaroundRunTrhead

Ability to disable auto-start

Author: mmatl

pyrender/viewer.py

@@ -175,7 +175,9 @@ class Viewer(pyglet.window.Window):
 
     def __init__(self, scene, viewport_size=None,
                  render_flags=None, viewer_flags=None,
-                 registered_keys=None, run_in_thread=False, **kwargs):
+                 registered_keys=None, run_in_thread=False,
+                 auto_start=True,
+                 **kwargs):
 
         #######################################################################
         # Save attributes and flags
@@ -188,6 +190,7 @@ def __init__(self, scene, viewport_size=None,
         self._is_active = False
         self._should_close = False
         self._run_in_thread = run_in_thread
+        self._auto_start = auto_start
 
         self._default_render_flags = {
             'flip_wireframe': False,
@@ -346,7 +349,11 @@ def __init__(self, scene, viewport_size=None,
             self._thread = Thread(target=self._init_and_start_app)
             self._thread.start()
         else:
-            self._init_and_start_app()
+            if auto_start:
+                self._init_and_start_app()
+
+    def start(self):
+        self._init_and_start_app()
 
     @property
     def scene(self):
@@ -557,7 +564,7 @@ def on_draw(self):
         if self._renderer is None:
             return
 
-        if self.run_in_thread:
+        if self.run_in_thread or not self._auto_start:
             self.render_lock.acquire()
 
         # Make OpenGL context current
@@ -592,7 +599,7 @@ def on_draw(self):
                     align=caption['location']
                 )
 
-        if self.run_in_thread:
+        if self.run_in_thread or not self._auto_start:
             self.render_lock.release()
 
     def on_resize(self, width, height):