Uniformly spreading a texture across multiple objects using the Unity standard shader

Hello, what I am looking to accomplish is having one texture appear over the course of a number of objects uninterrupted. For example in the image below the hexagons are my tilled objects and for the sake of this question the orange shape is the texture I want to uniformly spread across the objects.

I achieved this with my own little diffuse shader which had the texture mapping done in world space. However I need to make use of a number of the features in Unitys standard shader so I was going to add a worldspace mapping option for that, however after downloading and taking a look at the standard shaders I discovered they are split up into half a dozen different files. I have just a passing knowledge of shaders and was wondering if anyone had any suggestions on how to add worldspace texture mapping to unitys default standard shader. Thanks for any suggestions.