With a shape from the shape generator the textures should apply perfectly if the surface has the same same aspect ratio as the texture image. Very strange that they still stretch.
Fixing it with Blender is simple:
1 - Import the model in Blender
2 - Rotate/tilt so the surface you want to fix is front an vertical in the view.
3 - Select only the face(s) of that front view.
4 - Select Mesh > UV Unwrap > Project from View (Bounds)
5 - Repeat for the other sides. (Don't forget to first unselect the faces you have just done.)
The "Project from View (Bounds)" fixes the texture positioning so it exactly fills the selected area.
(I do this using the old Blender 2.72. I spend many hours learning the ridiculous interface. And when I finally could use most of the functions I need... they came with a new version with a completely different interface. Which I have yet to learn, again...
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