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Thank you very much! Your method is very effective for my question and good for NonlinearRegress!! Best, YN
Thank you so much! But my version is 10.2, so it seems that the "BoundingRegion" cannot work. Do you know how to do with 10.2? cheers, YN
Hi, You can get it by h = RegionPlot3D[(x^2 + 9/4 y^2 + z^2 - 1)^3 - x^2 z^3 - 9/(80) y^2 z^3
Yes, you find an effective way to combine geometries. But there's still problem. When I run this: rg = RegionUnion[Cylinder[{{0.7, 0, 1.4}, {0.1, 0, 2.1}}, .1], Ball[{0.1, 0, 2.1}, .1], Cylinder[{{0.1, 0, 2.1}, {-0.4, 0.6,...