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I want to create a lens that is 4.66" in diameter and 1" tall. The way I created it was: Create a flat circle with target diameter Create a hemisphere (diameter doesn't really matter, just needs to be a lot bigger than the flat circle) Align the flat circle vertically so it matches the diameter at a specific height of the hemisphere Use the split tool to create a solid section Take that new almost-there lens and convert it to NURBS Adjust the height to 1" If I instead: Create a hemisphere at 4.66" in diameter Convert to NURBS Adjust the height to 1" I end up with more of Pancake shape (V2) then a lens shape (V1): Does anyone have a recommended workflow for this?