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I renamed all the uv so when it was merged it will be merged as 1

enter image description here

but even after uv is renamed etc. the looks still changes when joining. enter image description here

images after joining

what causes this and how do I fix this?

here is the file link:

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1 Answer 1

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You have 3 objects. The one called car breakdown has a material that uses the Generated output of the Texture Coordinate node. The one called car breakdown.027 has a Gradient Texture node, which by default also works as if it used the Generated output of a Texture Coordinate. Generated takes the proportions of your object into account, if you stretch your object on X in Edit mode it will also stretch the texture. When you join all these objects, the new object is longer, it explains why your textures are stretched. The solution is to adjust the position of the needles in the ColorRamp nodes of your materials.

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