feat: process and plot contour over a mesh during pv to mesh3d conversion (#450)

Co-authored-by: pyansys-ci-bot <[email protected]>

Author: moe-ad

doc/changelog.d/450.miscellaneous.md

@@ -0,0 +1 @@
+Feat: process and plot contour over a mesh during pv to mesh3d conversion

src/ansys/tools/visualization_interface/backends/plotly/plotly_interface.py

@@ -108,7 +108,17 @@ def _convert_polydata_to_mesh3d(self, pv_mesh: PolyData) -> go.Mesh3d:
         faces = triangulated_mesh.faces.reshape((-1, 4))  # Now we know all faces are triangular (3 vertices + count)
         i, j, k = faces[:, 1], faces[:, 2], faces[:, 3]
 
-        return go.Mesh3d(x=x, y=y, z=z, i=i, j=j, k=k)
+        # Check if there is an active point dataset
+        array = None
+        if triangulated_mesh.point_data.active_scalars_name:
+            array_name = triangulated_mesh.point_data.active_scalars_name
+            array = triangulated_mesh.point_data[array_name]
+
+            # If each entry of the array is a vector, compute the norm
+            if array.ndim > 1:
+                array = ((array * array).sum(axis=1))**0.5
+
+        return go.Mesh3d(x=x, y=y, z=z, i=i, j=j, k=k, intensity=array)
 
 
     @property