I modelled an object in Siemens NX with dimensions 150x150x60mm and I want to apply a tile-able texture to it with dimensions 10x10mm. The size of the texture needs be the right scale, since I need to export the obj-file for my machine input.
I need a method that I can apply to shapes and textures with unknown scaling factors.
Well exporting textures is going to be an issue but I'll assume here you will only require exporting UV coordinates.
This would be trivial to accomplish using any type of automated texture coordinates like Generated or Object, however, to be able to export texture coordinates you will most likely be required to unwrap your mesh and create a UV map, unwrapping doesn't translate well into scene referred units, since unwrapping will more often than not introduce distortions.
The way I see it you have two options, both involving third party addons.
Either use World Scale UV or Magic UV addon.
What they both do is try to unwrap your mesh in such way that it approximates texture size to a defined scene dimention.
