dont use reverse_y=False in the examples

dash_slicer/slicer.py

@@ -26,6 +26,7 @@ class VolumeSlicer:
       reverse_y (bool): Whether to reverse the y-axis, so that the origin of
         the slice is in the top-left, rather than bottom-left. Default True.
         (This sets the figure's yaxes ``autorange`` to "reversed" or True.)
+        Note: setting this to False affects performance, see #12.
       scene_id (str): the scene that this slicer is part of. Slicers
         that have the same scene-id show each-other's positions with
         line indicators. By default this is derived from ``id(volume)``.

examples/slicer_with_1_plus_2_views.py

@@ -28,14 +28,10 @@
 ori = 1000, 2000, 3000
 
 
-slicer1 = VolumeSlicer(
-    app, vol1, axis=1, origin=ori, reverse_y=False, scene_id="scene1"
-)
-slicer2 = VolumeSlicer(
-    app, vol1, axis=0, origin=ori, reverse_y=False, scene_id="scene1"
-)
+slicer1 = VolumeSlicer(app, vol1, axis=1, origin=ori, scene_id="scene1")
+slicer2 = VolumeSlicer(app, vol1, axis=0, origin=ori, scene_id="scene1")
 slicer3 = VolumeSlicer(
-    app, vol2, axis=0, origin=ori, spacing=spacing, reverse_y=False, scene_id="scene1"
+    app, vol2, axis=0, origin=ori, spacing=spacing, scene_id="scene1"
 )
 
 app.layout = html.Div(

examples/slicer_with_3_views.py

@@ -16,9 +16,9 @@
 
 # Read volumes and create slicer objects
 vol = imageio.volread("imageio:stent.npz")
-slicer1 = VolumeSlicer(app, vol, reverse_y=False, axis=0)
-slicer2 = VolumeSlicer(app, vol, reverse_y=False, axis=1)
-slicer3 = VolumeSlicer(app, vol, reverse_y=False, axis=2)
+slicer1 = VolumeSlicer(app, vol, axis=0)
+slicer2 = VolumeSlicer(app, vol, axis=1)
+slicer3 = VolumeSlicer(app, vol, axis=2)
 
 # Calculate isosurface and create a figure with a mesh object
 verts, faces, _, _ = marching_cubes(vol, 300, step_size=2)