Fixing small typo in mediapipe demo

examples/mediapipe/realsense-dev.yml

@@ -18,7 +18,7 @@ nodes:
       - points3d
 
   - id: plot
-    build: pip install dora-rerun
+    build: pip install -e ../../node-hub/dora-rerun
     path: dora-rerun
     inputs:
       realsense/image: camera/image

node-hub/dora-mediapipe/dora_mediapipe/main.py

@@ -15,7 +15,7 @@ mp_draw = mp.solutions.drawing_utils
 def get_3d_coordinates(landmark, depth_frame, w, h, resolution, focal_length):
     cx, cy = int(landmark.x * w), int(landmark.y * h)
     if 0 < cx < w and 0 < cy < h:
-        depth = depth_frame[cx, cy] / 1_000.0
+        depth = depth_frame[cy, cx] / 1_000.0
         if depth > 0:
             fx, fy = focal_length
             ppx, ppy = resolution