Blender

UV Unwarp



Go to Edit mode, Then UV Editing
In Data, Choose UV map and click - sign to remove old UV map
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Select all vertix of object (hit A),
hit U or UV icon on top, Unwrap
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Click +New or open the image texture, set as follow if choose new
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image.png

Go to Shading,
add new material, select the BSDF and hit Ctrl T (create image texture, mapping and coordinate nodes)
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Activate Node Wrangler Add on
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Add image by clicking the node below, select the image
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Change the 3D persepective interface to Material Preview mode to see the texture just added on the object
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Select with edge nodes to select which parts want to separate as independent UV map
Use Mark Seam (show with red line to recognize)
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After manually improve the default mapping,
Select all in 3d perspective and click Unwrap again.

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Try clicking the ⋯ next to your doc name or using a keyboard shortcut (
CtrlP
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