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Hi,

I am trying to render the green cone shaped hats as you can on the pictures above, but there are weird stripes around it

I followed youtube instructions and did turn on auto smooth (30 degrees) under 'Normals' section, but it does not seem to work at all

What am I missing out and what other ways would you recommend? Thanks :)

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The smoothing algorithm fakes normals across polygons with a linear interpolation across the triangles into which they are divided for rendering, between the vertex normals at the triangles' corners. Asking that interpolation to simulate the curvature of a surface when the triangles are very long and thin is, literally, a bit of a stretch.

To give smoothing a chance, it's better to have those triangles approach equilateral as closely as possible, and to have smooth transitions between the sizes of faces, where you want smooth transitions between interpolated normals.

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Just CtrlShiftB bevelling the vertex at the point a tiny amount, CtrlB bevelling the base perimeter a bit, with 2 segments and a profile of 1, and CtrlR cutting some edge-loops around the cone, as above. gives the smoothing algorithm more to chew on:

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If you're getting really fanatical, you can delete the N-gon at the tip, and CtrlF Face menu > Grid Fill it, putting a couple more edge loops in there to aid the transition:

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.. and even Catmull-Clark Subdivide the result... It depends on how far you want to go.

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  • $\begingroup$ Hi, sorry for the late accept, thank you for the detailed answer!! :) $\endgroup$ Dec 20 '20 at 5:37
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Try selecting the hat object and choosing Shade Smooth from the Object Context Menu (Right-click, or W key) then Auto-Smooth Normals should function as intended.

Shade smooth

You can also set individual faces to have smooth shading in Edit Mode, using the Face Context Menu.

Smooth Faces

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