Set "Allow CPU Access" on mesh
I'm working with the "Slice Procedural Mesh" function from the 4.13 release.
It's working fine, but you have to set the "Allow CPU Access flag in the mesh editor.
Do you really have to set it manually or is there a automatic way, I don't know, when importing, or in the construction script from a BP or ... I don't know. This would help me to not click some hundred files :)
EDIT mark all meshes, right click, asset action, bulk edit via property matrix
The best way I found to set the flag quick is to mark all of your meshes (or a lot) -> right cklick -> edit, hover over the checkbox -> click it -> Ctrl+F4 (closes current tab) and then you have automatically your mouse over the next mesh and you can click it and close it.
Fastes way I found
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