Issue: 🐛Bug report | Crash when changing displacement map values for certain entries

[stevenlabelle]

Description: Changing the displacement map to certain entries crashes FBS.

Dev Version 3.0.0.ad2446aad

Steps to reproduce:

1. Open a model on the post side.
2. Under the model tree navigate to Displacement Map.
3. Change the data field entry to one of the following: Lagrange strain, initial position, position. FBS will crash.

[SteveMaas1978]

I fixed this issue by limiting the types of fields that can be selected for the displacement map. Now, only vector fields that don't depend recursively on the displacement (e.g. the position fields), will be listed here.

[stevenlabelle]

Thanks, this is working now.

Would it be possible to leave the initial position as an option? The intended use would be to scale the model along the z direction so that XY slice plots can have more space between slices.

[SteveMaas1978]

The initial position actually also depends on the displacement. The initial position is the reference coordinates + the displacement at time 0. I think this was done for some restart problems, I'm not sure. I can look into it a bit more, but a possible work-around would be to copy the initial position field with a data filter (e.g. scale with a scale factor of 1). This will copy the initial position values into a new data field that can be used for the displacement.

[stevenlabelle]

I can move that to a separate feature request then. Thanks!