Added previewPass

cura/PreviewPass.py

@@ -0,0 +1,28 @@
+# Copyright (c) 2017 Ultimaker B.V.
+# Uranium is released under the terms of the LGPLv3 or higher.
+
+from UM.Application import Application
+from UM.View.RenderPass import RenderPass
+from UM.Scene.Camera import Camera
+
+##  A render pass subclass that renders everything with default parameters, but can be used with a non-default camera
+#
+#   This is useful to get a preview image of a scene taken from a different location as the active camera.
+class PreviewPass(RenderPass):
+    def __init__(self, width, height):
+        super().__init__("preview", width, height, 0)
+
+        self._camera = Application.getInstance().getController().getScene().getActiveCamera()
+        self._renderer = Application.getInstance().getRenderer()
+
+    #   Override the camera to be used for this render pass
+    def setCamera(self, camera: Camera):
+        self._camera = camera
+
+    def render(self):
+        self.bind()
+
+        for batch in self._renderer.getBatches():
+            batch.render(self._camera)
+
+        self.release()