I have a model (the pipe) that's below the ground, and a polygon (red) on the ground that I want to use to anchor the pipe model, like in this video (and second image below): https://youtu.be/W6uzB2A8T5s?t=85

My (obj) 3D model has the red polygon on elevation 0 and the pipe with negative elevation. Unfortunately, when I load the fmear file, the bottom of the entire model (polygon+pipe) becomes 0, and the ground plane polygon floats in the air, which makes the placement impossible. Is there a way to push the pipe below ground? Since the app is on github I wouldn't mind trying to compile it, I just need to know what to change. For now hardcoding the offset would work too.