Error: Orthogonalise a grid which has been clipped by Polygon https://dlt-acc.firelay.cloud/en/c/message_boards/find_thread?p_l_id=4041874&threadId=4391554 2026-05-12T15:59:55Z 2026-05-12T15:59:55Z Julius Schlumberger https://dlt-acc.firelay.cloud/en/c/message_boards/find_message?p_l_id=4041874&messageId=4391565 2021-01-17T12:11:14Z 2021-01-17T12:11:14Z

... to add to the strange event: It also turned out that the error occurs for a given polygon, where an orthogonalization was tried to be repeated (so it worked once but not twice.

Julius Schlumberger 2021-01-17T12:11:14Z Julius Schlumberger https://dlt-acc.firelay.cloud/en/c/message_boards/find_message?p_l_id=4041874&messageId=4391553 2021-01-17T11:46:57Z 2021-01-17T11:46:57Z

Dear all,<br />I have a large grid for flood modelling of a large area including a city. To reduce the number of cells, I delete some cells inside the buildings with a certain distance from the surface so that the buildings are basically represented by a ring of cells at the surface to allow for momentum exchange (see 0117_Visualization for an example, the polygon line represents the surface of the buildings). The cells inside the houses were deleted using polygons (load polygons --&gt; select delete polygons --&gt; apply to all loaded polygons).<br />When I now try to orthogonalise the grid, it gives me a couple of error messages, which I am trying to figure out:<br />* orthonet_assign_xieta: inappropriate fictious boundary cell<br />* orthonet_comp_ops: orthonet_assignxieta gave error<br />* orthonet: orthonet_compweights_smooth gave error<br />I looked into possible reasons particularly for the first error message (so if there is any boundary cell that looks sketchy), but I could not find any. Instead, I observed the following: i created a polygon around an area at stake and tried to orthogonalize the grid inside. It gave above error message. <br />However, when I subdivided the area using multiple polygons (I used three, and I made sure, that the new polygons always overlap, see 0117_Polygons. The selected polygon represents the large polygon). These smaller polygons combined cover the entire area of the large polygon (and even a bit more). When orthogonalizing inside the small polygons, I don&#39;t get above error messages. <br />Now I am wondering, what the reason for this could be. Is it a bug or did I miss something?<br />Any thoughts or comments are welcome!<br />Best Regards, Julius<br /><br />(P.S. to the developers: It might be super helpful to always show a yellow dot in case of an error in RGFGRID. This is already implemented for folded grid (which I was so glad about, but it would be super handy here as well I think.)

Julius Schlumberger 2021-01-17T11:46:57Z