I am hoping to show the simplified impact of different flood heights in my scene. I have a polygon that covers the extent, and I would like to be able to extrude it to a specified water height. However, I'm not sure how to make my polygon sit flat at 0 metres to start. The terrain in my scene starts at -1.5m, and I don't know if my polygon is starting from here or zero elevation or something else.
Right now my code looks like this:
Is this correct? Do I need to add/change/remove anything? Thanks!