Fix slicer pre-transforming the planes' center

* this created problems when adding a plane mesh into a scene
* additionally it adds the parameter 'both' to plan.show()

brainglobe_heatmap/planner.py

@@ -75,7 +75,7 @@ def __init__(
         print_plane("Plane 0", self.slicer.plane0, blue_dark)
         print_plane("Plane 1", self.slicer.plane1, pink_dark)
 
-    def show(self):
+    def show(self, both=True):
         """
         Renders the hetamap visualization as a 3D scene in brainrender.
         """
@@ -88,15 +88,19 @@ def show(self):
 
         # add slicing planes and their norms
         for plane, color, alpha in zip(
-            (self.slicer.plane0, self.slicer.plane1),
+            (
+                (self.slicer.plane0, self.slicer.plane1)
+                if both
+                else (self.slicer.plane0,)
+            ),
             (blue_dark, pink_dark),
             (0.8, 0.3),
             strict=False,
         ):
             plane_mesh = plane.to_mesh(self.scene.root)
             plane_mesh.alpha(alpha).color(color)
 
-            self.scene.add(plane_mesh, transform=False)
+            self.scene.add(plane_mesh)
             for vector, v_color in zip(
                 (plane.normal, plane.u, plane.v),
                 (color, red_dark, green_dark),
@@ -109,12 +113,12 @@ def show(self):
                         + np.array(vector) * self.arrow_scale,
                         c=v_color,
                     ),
-                    transform=False,
+                    classes="plane_mesh",
                 )
 
             self.scene.add(
                 Sphere(plane_mesh.center, r=plane_mesh.width / 125, c="k"),
-                transform=False,
+                classes="plane_mesh",
             )
 
         self.scene.render(interactive=self.interactive, zoom=self.zoom)

brainglobe_heatmap/slicer.py

@@ -51,7 +51,6 @@ def __init__(
                 )
 
         position = np.array(position)
-        position[2] = -position[2]
 
         if isinstance(orientation, str):
             axidx = get_ax_idx(orientation)