Why does Rhino have lots of issues in filleting complex surfaces while Solidworks usually fillets easily?

[wim (Wim Dekeyser)]

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Apply Edge Softening and extract the render mesh

Hi, would like to extract the render mesh after applying edge softening in my model but I just keep getting chamfers in the edges of the meshed model instead of the fillet shape that I would like to achieve. Is it possible to get rounded edges? Is the fail related to the fact that the surfaces of the polysurface are degree 1 or 2? Thank you. [render mode][mesh]