Maintain a straight edge when applying texture

Question

I have an object to which I apply Filters > Textures > Rough Paper The object has straight edges and when I apply the filter they become irregular. I would like to get the texture but keep the edges straight. How can I do this?

Answer 1

Select the object, and then go to Filters -> Filter editor.

Click on Displacement map (this is the component that randomly displaces the shape (and its border).

Select a scale of 0.