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I was following the doughnut tutorial made by Blender Guru,and I bumped into some problem:

1.I can't get the purple doughnut in UV editing mode. (So I UV unwrapped,did get a purple doughnut in Texture paint mode(not in UV editing mode),but don't know what would that help or effect anything) enter image description here (After UV unwrap) enter image description here (Got a purple doughnut in Texture paint mode)

2.And then I pressed the + New on top of the left panel to add a new image(2048*1042),and used Shading node to add the image to the texture of the doughnut,then I started painting,found out that my texture is repeating. enter image description here (Add the texture to the doughnut) enter image description here (The texture repeating)

Sorry for the bad English.

Have a nice day.

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It is repeating either because you've unwrapped every quad to the whole UV coordinate space (each quad becomes a square going from x:0,y:0 to x:1, y:1), or because of this setting on your Image Texture node:

What this "Repeat" means is that if a particular point of a mesh is mapped (in the UV map) to a point (texel) outside the texture (e.g. x: -5), then it should be "wrapped" from the other side, so for an image 2048 pixels long, the x: -5 becomes x: 2048-5 = x: 2043. This repeats, so x: -6000 becomes x: 2048-5000 = x: -2952, which becomes x: 2048-2952, which becomes x: 2048-904 = x: 1144. The effect is that a mesh with UV map spanning from x: -6144 to x: 2048 will repeat (horizontally) 4 times.

Go to the UV Editing tab, edit your mesh, select all faces (3, then A) and on the left side see if some of the quads go outside the texture - if so, select everything there (again 3, then A) and scale it down (S) until it fits. If you only see a single quad, then you need to properly unwrap the mesh.

How can I mark the seams to UV unwrap a torus?

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