Sphericity

Create a method to compute sphericity using a mesh based approach

docs/processing.md

@@ -28,3 +28,10 @@ Here, we provide functionalities designed specifically for 3D image analysis and
             - watershed
             - fade_mask
             - overlay_rgb_images
+
+::: qim3d.processing.features
+    options:
+        members:
+            - area
+            - volume
+            - sphericity
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