Me once again - tried that but still have some question. When working with Affinity Photo i can only create Pixel layers, right? Might it be a good idea to use Affinity Designer again on this? Also the filter section doesn't have any possibility to do an average blur on the layer below, right? At least didn't find that.
EDIT: saw your last post only after sending mine, sorry. I do have snapping on already. just failing on the vector creation until now - only get antialised pixel triangles.
Also: what is the shortcut for a new layer? Is there something similar to actions in photoshop? Something like a macro system?