When I try to convert linear to quadratic tets, why do I get the message like “Angle check failed for node XXXXX, Midpoint XXXXX linearized”?
This is mostly related to the resolution of the mesh. Under Edit mesh, change type, linear to quadratic, there is a button for ‘advanced options’. On the advanced options panel, there is an angular limit to control whether or not to project the midpoint node. If you have a coarse mesh in a region of the geometry where there is significant curvature, this angular limit may cause the midpoint nodes not to project. You could try increasing this angular limit, but we would recommend refining the mesh in the areas where this limit is causing the midpoint nodes not to project.
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