Handle operations between surfaces of different topology (#666)

equinor · Jun 11, 2021 · a145dc7 · a145dc7
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -11,6 +11,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [#658](https://github.com/equinor/webviz-subsurface/pull/658) - Refactored Tornado figure code to be more reusable. Improved the Tornado bar visualization, added table display
  and improved layout in relevant plugins.
 
+### Fixed
+- [#666](https://github.com/equinor/webviz-subsurface/pull/666) - Handle operations between surfaces with different topology in `SurfaceViewerFMU`
+
 ## [0.2.3] - 2021-06-07
 
 ### Changed

diff --git a/webviz_subsurface/plugins/_surface_viewer_fmu.py b/webviz_subsurface/plugins/_surface_viewer_fmu.py
@@ -731,13 +731,12 @@ def calculate_surface_difference(
     surface2: xtgeo.RegularSurface,
     calculation: str = "Difference",
 ) -> xtgeo.RegularSurface:
-    surface3 = surface.copy()
     if calculation == "Difference":
-        surface3.values = surface3.values - surface2.values
+        calculated_surface = surface - surface2
     elif calculation == "Sum":
-        surface3.values = surface3.values + surface2.values
+        calculated_surface = surface + surface2
     elif calculation == "Product":
-        surface3.values = surface3.values * surface2.values
+        calculated_surface = surface * surface2
     elif calculation == "Quotient":
-        surface3.values = surface3.values / surface2.values
-    return surface3
+        calculated_surface = surface / surface2
+    return calculated_surface