I retopologized a ground model over a photogrammetry mesh using the polygon pen tool. When done, I wanted to project a spline onto the new ground surface to create the basis for a brick sidewalk. But the spline refuses to budge. I can project it onto a sphere, a plane and a cube easy enough, but there is something about the new mesh I made that it doesn’t like. I’m sure it’s just a tick box I haven’t checked, though I’ve tried every one I could find. Model attached.
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