I took Moodflow's tgd and removed the image. Then colored the last couple of layers of rocks - so I could see it working...
Then I thought it would be interesting to see if I could put some of the detail onto the largest rock. Its already calculated so I attached it from two layers earlier. Yuk... but whats that on the left ?
Closer examination reveals that the idea is there but I can't control it. Looks inside out.
So try some experiments with inverse and lo and behold this.
I think we could use this mechanism in other places. Would anyone like to continue along this vein ?
I am sure we can improve this... more displacement somehow ?
Maybe there is an easier way to sort-of normalise than this ?
If you attach it to the blendshader it'll crash :-(