Surface not smooth and Raytraced mode blur

Hi, suddenly got 2 problems…why like that?

(Surface not smooth, no matter sweep , loft or surface network of curve)

(raytraced mode blur)

(rhino file)
surface problem.3dm (198.4 KB)

That is probably the case of viewport sharpness not being set to fully sharp in Tools > Options > Cycles

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Hi, thanks for your solve my viewport resolution problem.
But my drawing surface still appearance brindle like your shared image…

Are you talking about the hatch pattern on the metal? If you don’t want that set that to none.

Yes, where can I set none…
I am new for rhino…sorry for that.

Open the materials panel, select your material, change the bump texture to None:

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Thank you very much :slight_smile: