[substance designer] How can I apply dirt to a complicated shape using the nodes?

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oraeles77 triangle

I have been using SD for a long time so this isnt a begineer question, for this example I've used a blender square to explain my question.

If you look at the image you will see what Im looking for, ideally a node, which will apply dirt, lower to the ground= more dirt, higher from the ground=less dirt. I assume some sort of position map/world space normal thing would be necessary, however I can't find a node which quite does it.

the dirt gradient sort of sums up the type of image I'd like to see on each face, however I would also like the textures to be seamless, so I assume I should also use a triplanular node?

any advice would be welcome.


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